diff --git a/src/octoprint/static/js/app/viewmodels/files.js b/src/octoprint/static/js/app/viewmodels/files.js
index b9e6a931..459a3254 100644
--- a/src/octoprint/static/js/app/viewmodels/files.js
+++ b/src/octoprint/static/js/app/viewmodels/files.js
@@ -558,6 +558,17 @@ $(function() {
             var dropZoneSdBackground = $("#drop_sd_background");
             var timeout = window.dropZoneTimeout;
 
+            var dataTransfer = undefined;
+            if (e.dataTransfer) {
+                dataTransfer = e.dataTransfer;
+            } else if (e.originalEvent && e.originalEvent.dataTransfer) {
+                dataTransfer = e.originalEvent.dataTransfer;
+            }
+
+            if (!dataTransfer || !dataTransfer.items || dataTransfer.items.length > 1 || dataTransfer.items[0].kind != "file") {
+                return;
+            }
+
             if (!timeout) {
                 dropOverlay.addClass('in');
             } else {