check fragment state before displaying the next screen

Author: codeismail-waver

rave_android/src/main/java/com/flutterwave/raveandroid/francMobileMoney/FrancMobileMoneyFragment.java

@@ -203,8 +203,10 @@ public void showProgressIndicator(boolean active) {
     public void showWebPage(String authenticationUrl, String flwRef) {
 
         this.flwRef = flwRef;
-        new RaveVerificationUtils(this, ravePayInitializer.isStaging(), ravePayInitializer.getPublicKey(), ravePayInitializer.getTheme())
-                .showWebpageVerificationScreen(authenticationUrl,flwRef);
+        if (isAdded()){
+            new RaveVerificationUtils(this, ravePayInitializer.isStaging(), ravePayInitializer.getPublicKey(), ravePayInitializer.getTheme())
+                    .showWebpageVerificationScreen(authenticationUrl,flwRef);
+        }
     }