diff --git a/Source/Widgets/Cesium3DTilesInspector/Cesium3DTilesInspectorViewModel.js b/Source/Widgets/Cesium3DTilesInspector/Cesium3DTilesInspectorViewModel.js
index 8aa65327137a..187606053b60 100644
--- a/Source/Widgets/Cesium3DTilesInspector/Cesium3DTilesInspectorViewModel.js
+++ b/Source/Widgets/Cesium3DTilesInspector/Cesium3DTilesInspectorViewModel.js
@@ -536,9 +536,12 @@ define([
                 return maximumScreenSpaceError();
             },
             set : function(value) {
-                maximumScreenSpaceError(value);
-                if (that._tileset) {
-                    that._tileset.maximumScreenSpaceError = value;
+                value = Number(value);
+                if (!isNaN(value)) {
+                    maximumScreenSpaceError(value);
+                    if (that._tileset) {
+                        that._tileset.maximumScreenSpaceError = value;
+                    }
                 }
             }
         });
@@ -556,9 +559,12 @@ define([
                 return dynamicScreenSpaceErrorDensity();
             },
             set : function(value) {
-                dynamicScreenSpaceErrorDensity(value);
-                if (that._tileset) {
-                    that._tileset.dynamicScreenSpaceErrorDensity = value;
+                value = Number(value);
+                if (!isNaN(value)) {
+                    dynamicScreenSpaceErrorDensity(value);
+                    if (that._tileset) {
+                        that._tileset.dynamicScreenSpaceErrorDensity = value;
+                    }
                 }
             }
         });
@@ -594,9 +600,12 @@ define([
                 return dynamicScreenSpaceErrorFactor();
             },
             set : function(value) {
-                dynamicScreenSpaceErrorFactor(value);
-                if (that._tileset) {
-                    that._tileset.dynamicScreenSpaceErrorFactor = value;
+                value = Number(value);
+                if (!isNaN(value)) {
+                    dynamicScreenSpaceErrorFactor(value);
+                    if (that._tileset) {
+                        that._tileset.dynamicScreenSpaceErrorFactor = value;
+                    }
                 }
             }
         });