diff --git a/functions.php b/functions.php
index 19334dc..a3112f1 100644
--- a/functions.php
+++ b/functions.php
@@ -54,13 +54,16 @@ function makeThumb($item = "") {
       $imgdata = null;
       for ( $i=0; $i<$zip->numFiles; $i++ ) {
          $imgname = basename($zip->getNameIndex($i));
-         $imgext = strtolower(pathinfo($imgname)['extension']);
-         if ( (strcmp($lowest, $imgname) > 0)
-              && ((strcasecmp($imgext, "jpg") == 0)
-                  || (strcasecmp($imgext, "png") == 0)
-                  || (strcasecmp($imgext, "webp") == 0)) ) {
-            $lowest = $imgname;
-            $imgdata = $zip->getFromIndex($i);
+         $parts = pathinfo($imgname);
+         if ( isset($parts['extension']) ) {
+            $imgext = strtolower($parts['extension']);
+            if ( (strcmp($lowest, $imgname) > 0)
+                 && ((strcasecmp($imgext, "jpg") == 0)
+                     || (strcasecmp($imgext, "png") == 0)
+                     || (strcasecmp($imgext, "webp") == 0)) ) {
+               $lowest = $imgname;
+               $imgdata = $zip->getFromIndex($i);
+            }
          }
       }
       $zip->close();
@@ -74,14 +77,17 @@ function makeThumb($item = "") {
       $lowest = "~";
       foreach ( $entries as $entry ) {
          $imgname = $entry->getName();
-         $imgext = strtolower(pathinfo($imgname)['extension']);
-         if ( (strcmp($lowest, $imgname) > 0)
-              && ((strcasecmp($imgext, "jpg") == 0)
-                  || (strcasecmp($imgext, "png") == 0)
-                  || (strcasecmp($imgext, "webp") == 0)) ) {
-            $lowest = $imgname;
-            $didwrite = $entry->extract(false, $outfile);
-            if ( !$didwrite ) { return false; }
+         $parts = pathinfo($imgname);
+         if ( isset($parts['extension']) ) {
+            $imgext = strtolower($parts['extension']);
+            if ( (strcmp($lowest, $imgname) > 0)
+                 && ((strcasecmp($imgext, "jpg") == 0)
+                     || (strcasecmp($imgext, "png") == 0)
+                     || (strcasecmp($imgext, "webp") == 0)) ) {
+               $lowest = $imgname;
+               $didwrite = $entry->extract(false, $outfile);
+               if ( !$didwrite ) { return false; }
+            }
          }
       }
       rar_close($rar_file);