diff --git a/.changelog/39039.txt b/.changelog/39039.txt
new file mode 100644
index 00000000000..a96c9183335
--- /dev/null
+++ b/.changelog/39039.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_elbv2_listener: Fix crash when reading forward actions not configured in state
+```
diff --git a/internal/service/elbv2/listener.go b/internal/service/elbv2/listener.go
index 3646685ddab..012c19e6f27 100644
--- a/internal/service/elbv2/listener.go
+++ b/internal/service/elbv2/listener.go
@@ -1020,7 +1020,7 @@ func flattenLbForwardAction(d *schema.ResourceData, attrName string, i int, awsA
 	}
 
 	if rawState := d.GetRawState(); rawState.IsKnown() && !rawState.IsNull() {
-		if defaultActions := rawState.GetAttr(attrName); defaultActions.LengthInt() > 0 {
+		if defaultActions := rawState.GetAttr(attrName); defaultActions.IsKnown() && !defaultActions.IsNull() && defaultActions.LengthInt() > 0 {
 			flattenLbForwardActionOneOf(defaultActions, i, awsAction, actionMap)
 			return
 		}