diff --git a/html/script.js b/html/script.js
index e7e5064..d04911d 100644
--- a/html/script.js
+++ b/html/script.js
@@ -2710,7 +2710,8 @@ function onSearch(e) {
     const searchTerm = $("#search_input").val().trim();
     $("#search_input").val("");
     $("#search_input").blur();
-    findPlanes(searchTerm, true, true, true, true);
+    if (searchTerm)
+        findPlanes(searchTerm, true, true, true, true);
     return false;
 }
 
@@ -2766,17 +2767,6 @@ function onResetAltitudeFilter(e) {
     refreshTableInfo();
 }
 
-function onFilterByAltitude(e) {
-    e.preventDefault();
-    $("#type_filter").blur();
-
-    updatePlaneFilter();
-
-    refreshSelected();
-    refreshHighlighted();
-    refreshTableInfo();
-}
-
 function updatePlaneFilter() {
     var minAltitude = parseFloat($("#altitude_filter_min").val().trim());
     var maxAltitude = parseFloat($("#altitude_filter_max").val().trim());