fix: Frame Processor error when frame processors aren't used

src/Camera.tsx

@@ -343,10 +343,12 @@ export class Camera extends React.PureComponent<CameraProps> {
    * @internal
    */
   componentWillUnmount(): void {
+    if (this.lastFrameProcessor != null || this.props.frameProcessor != null) {
       this.assertFrameProcessorsEnabled();
       // @ts-expect-error JSI functions aren't typed
       global.unsetFrameProcessor(this.handle);
     }
+  }
 
   /**
    * @internal