diff --git a/src-ui/src/app/components/common/pdf-viewer/pdf-viewer.component.ts b/src-ui/src/app/components/common/pdf-viewer/pdf-viewer.component.ts
index 032ccd3e0..f08b0a90d 100644
--- a/src-ui/src/app/components/common/pdf-viewer/pdf-viewer.component.ts
+++ b/src-ui/src/app/components/common/pdf-viewer/pdf-viewer.component.ts
@@ -272,7 +272,7 @@ export class PngxPdfViewerComponent
     if (!this.hasRenderedPage) {
       return
     }
-    const query = this.searchQuery.trim()
+    const query = this.searchQuery?.trim()
     if (query === this.lastFindQuery) {
       return
     }