fixing getPointerCoordinates call function

Author: JuanjoOrt

src/index.js

@@ -615,7 +615,7 @@ export default class CanvasDraw extends PureComponent {
   };
 
   loop = ({ once = false } = {}) => {
-    if (this.mouseHasMoved || this.valuesChanged) {
+    if (this.lazy && (this.mouseHasMoved || this.valuesChanged)) {
       const pointer = this.lazy.getPointerCoordinates();
       const brush = this.lazy.getBrushCoordinates();