diff --git a/lib/extract/extractBrush.js b/lib/extract/extractBrush.js
index e7599f0b..c0e6550b 100644
--- a/lib/extract/extractBrush.js
+++ b/lib/extract/extractBrush.js
@@ -3,7 +3,7 @@ import extractColor from './extractColor';
 const urlIdPattern = /^url\(#(.+?)\)$/;
 
 export default function extractBrush(colorOrBrush) {
-  if (colorOrBrush === 'none' || !colorOrBrush) {
+  if (!colorOrBrush || colorOrBrush === 'none') {
     return null;
   }
 
@@ -11,7 +11,7 @@ export default function extractBrush(colorOrBrush) {
     return [2];
   }
   try {
-    const matched = colorOrBrush.match(urlIdPattern);
+    const matched = typeof colorOrBrush === 'string' && colorOrBrush.match(urlIdPattern);
     // brush
     if (matched) {
       return [1, matched[1]];
diff --git a/lib/extract/extractGradient.js b/lib/extract/extractGradient.js
index 8415b45e..b2d01ea3 100644
--- a/lib/extract/extractGradient.js
+++ b/lib/extract/extractGradient.js
@@ -17,7 +17,7 @@ function percentToFloat(percent) {
   ) {
     return percent.__getAnimatedValue();
   }
-  const matched = percent.match(percentReg);
+  const matched = typeof percent === 'string' && percent.match(percentReg);
   if (!matched) {
     console.warn(`"${percent}" is not a valid number or percentage string.`);
     return 0;