check if happen NullPointer

app/src/main/java/com/frank/ffmpeg/activity/ProbeFormatActivity.kt

@@ -45,12 +45,14 @@ class ProbeFormatActivity : BaseActivity() {
                 MSG_FINISH -> {
                     progressProbe!!.visibility = View.GONE
                     layoutProbe!!.visibility = View.VISIBLE
-                    val result = msg.obj as MediaBean
+                    val result = msg.obj?: msg.obj
-                    val resultFormat = JsonParseTool.stringFormat(result)
+                    if (result != null) {
+                        val resultFormat = JsonParseTool.stringFormat(result as MediaBean)
                         if (!TextUtils.isEmpty(resultFormat) && txtProbeFormat != null) {
                             txtProbeFormat!!.text = resultFormat
                         }
                     }
+                }
                 else -> {
                 }
             }