diff --git a/fints4k/src/commonMain/kotlin/net/codinux/banking/fints/FinTsJobExecutor.kt b/fints4k/src/commonMain/kotlin/net/codinux/banking/fints/FinTsJobExecutor.kt
index 2c71fb96..213aaf60 100644
--- a/fints4k/src/commonMain/kotlin/net/codinux/banking/fints/FinTsJobExecutor.kt
+++ b/fints4k/src/commonMain/kotlin/net/codinux/banking/fints/FinTsJobExecutor.kt
@@ -590,7 +590,8 @@ Log.info { "Terminating waiting for TAN input" } // TODO: remove again
 
             val initDialogResponse = initDialogWithStrongCustomerAuthentication(context)
 
-            if (initDialogResponse.successful == false) {
+            // if lastCreatedMessage was a dialog init message, there's no need to send this message again, we just initialized a new dialog in initDialogWithStrongCustomerAuthentication()
+            if (initDialogResponse.successful == false || lastCreatedMessage.isDialogInitMessage()) {
                 return initDialogResponse
             } else {
                 val newMessage = messageBuilder.rebuildMessage(context, lastCreatedMessage)
diff --git a/fints4k/src/commonMain/kotlin/net/codinux/banking/fints/messages/MessageBuilderResult.kt b/fints4k/src/commonMain/kotlin/net/codinux/banking/fints/messages/MessageBuilderResult.kt
index 5c56f824..4b70d097 100644
--- a/fints4k/src/commonMain/kotlin/net/codinux/banking/fints/messages/MessageBuilderResult.kt
+++ b/fints4k/src/commonMain/kotlin/net/codinux/banking/fints/messages/MessageBuilderResult.kt
@@ -1,6 +1,8 @@
 package net.codinux.banking.fints.messages
 
+import net.codinux.banking.fints.messages.datenelementgruppen.implementierte.Segmentkopf
 import net.codinux.banking.fints.messages.segmente.Segment
+import net.codinux.banking.fints.messages.segmente.implementierte.Verarbeitungsvorbereitung
 import net.codinux.banking.fints.messages.segmente.implementierte.ZweiSchrittTanEinreichung
 
 
@@ -32,4 +34,10 @@ open class MessageBuilderResult(
                 && messageBodySegments.first() is ZweiSchrittTanEinreichung
     }
 
+    open fun isDialogInitMessage(): Boolean =
+        messageBodySegments.any { it is Verarbeitungsvorbereitung }
+
+
+    override fun toString() = "${messageBodySegments.joinToString { (it.dataElementsAndGroups.firstOrNull() as? Segmentkopf)?.let { "${it.identifier}:${it.segmentVersion}" } ?: "<No Segment header>" } }}"
+
 }
\ No newline at end of file