diff --git a/rxfingerprint/src/main/java/com/mtramin/rxfingerprint/FingerprintObservable.java b/rxfingerprint/src/main/java/com/mtramin/rxfingerprint/FingerprintObservable.java
index 791c6dd..5111f17 100644
--- a/rxfingerprint/src/main/java/com/mtramin/rxfingerprint/FingerprintObservable.java
+++ b/rxfingerprint/src/main/java/com/mtramin/rxfingerprint/FingerprintObservable.java
@@ -80,7 +80,9 @@ private AuthenticationCallback createAuthenticationCallback(ObservableEmitter<T>
 			@Override
 			public void onAuthenticationError(int errMsgId, CharSequence errString) {
 				super.onAuthenticationError(errMsgId, errString);
-				emitter.onError(new FingerprintAuthenticationException(errString));
+				if (!emitter.isDisposed()) {
+					emitter.onError(new FingerprintAuthenticationException(errString));
+				}
 			}
 
 			@Override