diff --git a/packages/rules_prerender/inline_style_map.ts b/packages/rules_prerender/inline_style_map.ts
index 3bf5d415..2ab632ec 100644
--- a/packages/rules_prerender/inline_style_map.ts
+++ b/packages/rules_prerender/inline_style_map.ts
@@ -8,8 +8,7 @@
 let map: ReadonlyMap<string, string> | undefined;
 
 /** Returns the inline style map. */
-export function getMap(): ReadonlyMap<string, string> {
-    if (!map) throw new Error('Inline style map not set.');
+export function getMap(): ReadonlyMap<string, string> | undefined {
     return map;
 }
 
diff --git a/packages/rules_prerender/styles.ts b/packages/rules_prerender/styles.ts
index 4d6c0c75..c36b6feb 100644
--- a/packages/rules_prerender/styles.ts
+++ b/packages/rules_prerender/styles.ts
@@ -24,13 +24,17 @@ export function includeStyle(path: string): string {
  */
 export function inlineStyle(importPath: string): string {
     // Look up the import path in the inline style map to get its actual file
-    // path on disk.
+    // path on disk. This will always exist when executed as part of the
+    // renderer, however tests which directly call components won't set the
+    // inline style map and it won't exist. In these cases, we just ignore it
+    // since such tests would not actually care.
     const inlineStyleMap = getInlineStyleMap();
-    const filePath = inlineStyleMap.get(importPath);
+    const filePath = inlineStyleMap ? inlineStyleMap.get(importPath) : importPath;
     if (!filePath) {
         throw new Error(`Could not find "${
             importPath}" in the inline style map. Available imports are:\n\n${
-            Array.from(inlineStyleMap.keys()).join('\n')}`);
+            // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+            Array.from(inlineStyleMap!.keys()).join('\n')}`);
     }
 
     // Return an annotation with the real file path.
diff --git a/packages/rules_prerender/styles_test.ts b/packages/rules_prerender/styles_test.ts
index 6ebf38d0..76e7a860 100644
--- a/packages/rules_prerender/styles_test.ts
+++ b/packages/rules_prerender/styles_test.ts
@@ -45,6 +45,16 @@ wksp/foo/bar/baz.css
 wksp/hello/world.css
             `.trim());
         });
+
+        it('ignores the inline style map when not defined', () => {
+            spyOn(inlineStyleMap, 'getMap').and.returnValue(undefined);
+
+            expect(inlineStyle('wksp/foo/bar/baz.css')).toBe(`<!-- ${createAnnotation({
+                type: 'style',
+                scope: StyleScope.Inline,
+                path: 'wksp/foo/bar/baz.css',
+            })} -->`);
+        });
     });
 
     describe('inlineStyleLegacy()', () => {