diff --git a/examples/gif2webp.c b/examples/gif2webp.c
index b6a9964b..8c0a5851 100644
--- a/examples/gif2webp.c
+++ b/examples/gif2webp.c
@@ -359,6 +359,8 @@ int main(int argc, const char *argv[]) {
         if (DGifGetExtension(gif, &extension, &data) == GIF_ERROR) {
           goto End;
         }
+        if (data == NULL) continue;
+
         switch (extension) {
           case COMMENT_EXT_FUNC_CODE: {
             break;  // Do nothing for now.