diff --git a/app/src/protyle/util/editorCommonEvent.ts b/app/src/protyle/util/editorCommonEvent.ts
index 37c1e559c..a7dea2c3e 100644
--- a/app/src/protyle/util/editorCommonEvent.ts
+++ b/app/src/protyle/util/editorCommonEvent.ts
@@ -816,7 +816,7 @@ export const dropEvent = (protyle: IProtyle, editorElement: HTMLElement) => {
             return;
         }
         let target = event.target as HTMLElement;
-        if (target.classList.contains("av__gallery-img")) {
+        if (target.classList?.contains("av__gallery-img")) {
             target = hasClosestByClassName(target, "av__gallery-item") as HTMLElement;
         }
         if (!target) {