diff --git a/src/filters/webgl_backend.class.js b/src/filters/webgl_backend.class.js
index e69484e3..f352b242 100644
--- a/src/filters/webgl_backend.class.js
+++ b/src/filters/webgl_backend.class.js
@@ -219,51 +219,6 @@
       return pipelineState;
     },
 
-    /**
-     * The same as the applyFilter method but with additional logging of WebGL
-     * errors.
-     */
-    applyFiltersDebug: function(filters, source, width, height, targetCanvas, cacheKey) {
-      // The following code is useful when debugging a specific issue but adds ~10x slowdown.
-      var gl = this.gl;
-      var ret = this.applyFilters(filters, source, width, height, targetCanvas, cacheKey);
-      var glError = gl.getError();
-      if (glError !== gl.NO_ERROR) {
-        var errorString = this.glErrorToString(gl, glError);
-        var error = new Error('WebGL Error ' + errorString);
-        error.glErrorCode = glError;
-        throw error;
-      }
-      return ret;
-    },
-
-    glErrorToString: function(context, errorCode) {
-      if (!context) {
-        return 'Context undefined for error code: ' + errorCode;
-      }
-      else if (typeof errorCode !== 'number') {
-        return 'Error code is not a number';
-      }
-      switch (errorCode) {
-        case context.NO_ERROR:
-          return 'NO_ERROR';
-        case context.INVALID_ENUM:
-          return 'INVALID_ENUM';
-        case context.INVALID_VALUE:
-          return 'INVALID_VALUE';
-        case context.INVALID_OPERATION:
-          return 'INVALID_OPERATION';
-        case context.INVALID_FRAMEBUFFER_OPERATION:
-          return 'INVALID_FRAMEBUFFER_OPERATION';
-        case context.OUT_OF_MEMORY:
-          return 'OUT_OF_MEMORY';
-        case context.CONTEXT_LOST_WEBGL:
-          return 'CONTEXT_LOST_WEBGL';
-        default:
-          return 'UNKNOWN_ERROR';
-      }
-    },
-
     /**
      * Detach event listeners, remove references, and clean up caches.
      */
@@ -357,9 +312,11 @@
       if (this.gpuInfo) {
         return this.gpuInfo;
       }
-      var gl = this.gl;
+      var gl = this.gl, gpuInfo = { renderer: '', vendor: '' };
+      if (!gl) {
+        return gpuInfo;
+      }
       var ext = gl.getExtension('WEBGL_debug_renderer_info');
-      var gpuInfo = { renderer: '', vendor: '' };
       if (ext) {
         var renderer = gl.getParameter(ext.UNMASKED_RENDERER_WEBGL);
         var vendor = gl.getParameter(ext.UNMASKED_VENDOR_WEBGL);