diff --git a/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataProcessorApi.java b/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataProcessorApi.java
index 983dc4848d..656d5cf185 100644
--- a/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataProcessorApi.java
+++ b/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataProcessorApi.java
@@ -39,8 +39,7 @@ public DataProcessorApi(StreamPipesClientConfig clientConfig) {
   @Override
   protected StreamPipesApiPath getBaseResourcePath() {
     return StreamPipesApiPath.fromBaseApiPath()
-        .addToPath("sepas")
-        .addToPath("own");
+        .addToPath("sepas");
   }
 
   @Override
diff --git a/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataSinkApi.java b/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataSinkApi.java
index b6a574fa0b..d53d21047a 100644
--- a/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataSinkApi.java
+++ b/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataSinkApi.java
@@ -100,7 +100,6 @@ public DataSinkInvocation getDataSinkForPipelineElement(String templateId, DataS
   @Override
   protected StreamPipesApiPath getBaseResourcePath() {
     return StreamPipesApiPath.fromBaseApiPath()
-        .addToPath("actions")
-        .addToPath("own");
+        .addToPath("actions");
   }
 }
diff --git a/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataStreamApi.java b/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataStreamApi.java
index 935c474ffc..d3b8d28428 100644
--- a/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataStreamApi.java
+++ b/streampipes-client/src/main/java/org/apache/streampipes/client/api/DataStreamApi.java
@@ -103,7 +103,6 @@ public SpKafkaConsumer subscribe(SpDataStream stream,
   @Override
   protected StreamPipesApiPath getBaseResourcePath() {
     return StreamPipesApiPath.fromBaseApiPath()
-        .addToPath("streams")
-        .addToPath("own");
+        .addToPath("streams");
   }
 }
diff --git a/streampipes-resource-management/src/main/java/org/apache/streampipes/resource/management/AbstractPipelineElementResourceManager.java b/streampipes-resource-management/src/main/java/org/apache/streampipes/resource/management/AbstractPipelineElementResourceManager.java
index 7dacac05e4..da3aed9814 100644
--- a/streampipes-resource-management/src/main/java/org/apache/streampipes/resource/management/AbstractPipelineElementResourceManager.java
+++ b/streampipes-resource-management/src/main/java/org/apache/streampipes/resource/management/AbstractPipelineElementResourceManager.java
@@ -23,6 +23,7 @@
 import org.apache.streampipes.storage.api.CRUDStorage;
 
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 public abstract class AbstractPipelineElementResourceManager<T extends CRUDStorage<String, W>,
@@ -43,6 +44,7 @@ public List<String> findAllIdsOnly() {
   public List<X> findAllAsInvocation() {
     return findAll()
         .stream()
+        .filter(Objects::nonNull)
         .map(this::toInvocation)
         .collect(Collectors.toList());
   }
@@ -52,7 +54,12 @@ public W find(String elementId) {
   }
 
   public X findAsInvocation(String elementId) {
-    return toInvocation(find(elementId));
+    var element = find(elementId);
+    if (Objects.nonNull(element)) {
+      return toInvocation(find(elementId));
+    } else {
+      throw new IllegalArgumentException("Could not find element with id " + elementId);
+    }
   }
 
   public void delete(String elementId) {
diff --git a/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataProcessorResource.java b/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataProcessorResource.java
index 31991bf874..2d2ea2cc87 100644
--- a/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataProcessorResource.java
+++ b/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataProcessorResource.java
@@ -18,6 +18,7 @@
 
 package org.apache.streampipes.rest.impl.pe;
 
+import org.apache.streampipes.model.StreamPipesErrorMessage;
 import org.apache.streampipes.model.graph.DataProcessorDescription;
 import org.apache.streampipes.model.graph.DataProcessorInvocation;
 import org.apache.streampipes.model.message.NotificationType;
@@ -55,7 +56,6 @@ public List<DataProcessorDescription> getAvailable() {
   }
 
   @GET
-  @Path("/own")
   @JacksonSerialized
   @Produces({MediaType.APPLICATION_JSON})
   @PreAuthorize(AuthConstants.HAS_READ_PIPELINE_ELEMENT_PRIVILEGE)
@@ -65,7 +65,7 @@ public List<DataProcessorInvocation> getOwn() {
   }
 
   @DELETE
-  @Path("/own/{elementId}")
+  @Path("/{elementId}")
   @Produces(MediaType.APPLICATION_JSON)
   @JacksonSerialized
   @PreAuthorize(AuthConstants.HAS_DELETE_PIPELINE_ELEMENT_PRIVILEGE)
@@ -79,8 +79,12 @@ public Response removeOwn(@PathParam("elementId") String elementId) {
   @Produces(MediaType.APPLICATION_JSON)
   @JacksonSerialized
   @PreAuthorize(AuthConstants.HAS_READ_PIPELINE_ELEMENT_PRIVILEGE)
-  public DataProcessorInvocation getElement(@PathParam("elementId") String elementId) {
-    return getDataProcessorResourceManager().findAsInvocation(elementId);
+  public Response getElement(@PathParam("elementId") String elementId) {
+    try {
+      return ok(getDataProcessorResourceManager().findAsInvocation(elementId));
+    } catch (IllegalArgumentException e) {
+      return badRequest(StreamPipesErrorMessage.from(e));
+    }
   }
 
   private DataProcessorResourceManager getDataProcessorResourceManager() {
diff --git a/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataSinkResource.java b/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataSinkResource.java
index b289af8bfc..8eb7decebc 100644
--- a/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataSinkResource.java
+++ b/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataSinkResource.java
@@ -18,6 +18,7 @@
 
 package org.apache.streampipes.rest.impl.pe;
 
+import org.apache.streampipes.model.StreamPipesErrorMessage;
 import org.apache.streampipes.model.graph.DataSinkDescription;
 import org.apache.streampipes.model.graph.DataSinkInvocation;
 import org.apache.streampipes.model.message.NotificationType;
@@ -56,7 +57,6 @@ public List<DataSinkDescription> getAvailable() {
   }
 
   @GET
-  @Path("/own")
   @Produces({MediaType.APPLICATION_JSON, SpMediaType.JSONLD})
   @JacksonSerialized
   @PreAuthorize(AuthConstants.HAS_READ_PIPELINE_ELEMENT_PRIVILEGE)
@@ -66,7 +66,7 @@ public List<DataSinkInvocation> getOwn() {
   }
 
   @DELETE
-  @Path("/own/{elementId}")
+  @Path("/{elementId}")
   @Produces(MediaType.APPLICATION_JSON)
   @JacksonSerialized
   @PreAuthorize(AuthConstants.HAS_DELETE_PIPELINE_ELEMENT_PRIVILEGE)
@@ -80,8 +80,12 @@ public Response removeOwn(@PathParam("elementId") String elementId) {
   @Produces(MediaType.APPLICATION_JSON)
   @JacksonSerialized
   @PreAuthorize(AuthConstants.HAS_READ_PIPELINE_ELEMENT_PRIVILEGE)
-  public DataSinkInvocation getElement(@PathParam("elementId") String elementId) {
-    return getDataSinkResourceManager().findAsInvocation(elementId);
+  public Response getElement(@PathParam("elementId") String elementId) {
+    try {
+      return ok(getDataSinkResourceManager().findAsInvocation(elementId));
+    } catch (IllegalArgumentException e) {
+      return badRequest(StreamPipesErrorMessage.from(e));
+    }
   }
 
   private DataSinkResourceManager getDataSinkResourceManager() {
diff --git a/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataStreamResource.java b/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataStreamResource.java
index 760d664f91..09b79877c6 100644
--- a/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataStreamResource.java
+++ b/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/pe/DataStreamResource.java
@@ -19,6 +19,7 @@
 package org.apache.streampipes.rest.impl.pe;
 
 import org.apache.streampipes.model.SpDataStream;
+import org.apache.streampipes.model.StreamPipesErrorMessage;
 import org.apache.streampipes.model.message.NotificationType;
 import org.apache.streampipes.resource.management.DataStreamResourceManager;
 import org.apache.streampipes.rest.core.base.impl.AbstractAuthGuardedRestResource;
@@ -80,8 +81,12 @@ public Response delete(@PathParam("elementId") String elementId) {
   @Produces(MediaType.APPLICATION_JSON)
   @JacksonSerialized
   @PreAuthorize(AuthConstants.HAS_READ_PIPELINE_ELEMENT_PRIVILEGE)
-  public SpDataStream getElement(@PathParam("elementId") String elementId) {
-    return getDataStreamResourceManager().findAsInvocation(elementId);
+  public Response getElement(@PathParam("elementId") String elementId) {
+    try {
+      return ok(getDataStreamResourceManager().findAsInvocation(elementId));
+    } catch (IllegalArgumentException e) {
+      return badRequest(StreamPipesErrorMessage.from(e));
+    }
   }
 
   @POST
diff --git a/ui/projects/streampipes/platform-services/src/lib/apis/pipeline-element.service.ts b/ui/projects/streampipes/platform-services/src/lib/apis/pipeline-element.service.ts
index 51bf9ed543..66aa59918a 100644
--- a/ui/projects/streampipes/platform-services/src/lib/apis/pipeline-element.service.ts
+++ b/ui/projects/streampipes/platform-services/src/lib/apis/pipeline-element.service.ts
@@ -38,7 +38,7 @@ export class PipelineElementService {
     ) {}
 
     getDataProcessors(): Observable<DataProcessorInvocation[]> {
-        return this.http.get(this.dataProcessorsUrl + '/own').pipe(
+        return this.http.get(this.dataProcessorsUrl).pipe(
             map(data => {
                 return (data as []).map(dpi =>
                     DataProcessorInvocation.fromData(dpi),
@@ -48,7 +48,7 @@ export class PipelineElementService {
     }
 
     getDataSinks(): Observable<DataSinkInvocation[]> {
-        return this.http.get(this.dataSinksUrl + '/own').pipe(
+        return this.http.get(this.dataSinksUrl).pipe(
             map(data => {
                 return (data as []).map(dpi =>
                     DataSinkInvocation.fromData(dpi),
@@ -58,7 +58,7 @@ export class PipelineElementService {
     }
 
     getDataStreams(): Observable<SpDataStream[]> {
-        return this.http.get(this.dataStreamsUrl + '/own').pipe(
+        return this.http.get(this.dataStreamsUrl).pipe(
             map(data => {
                 return (data as []).map(dpi => {
                     if (