diff --git a/lib_com/options.h b/lib_com/options.h
index 80cd7a383bbd806dfa0f5fa82fac8262234d7590..65e625614e677b07ca92916391dab3e283b59ae7 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -171,7 +171,7 @@
 
 #define NONBE_1244_FIX_SWB_BWE_MEMORY                   /* VA: issue 1244: fix to SWB BWE memory in case of switching from FB coding - pending a review by Huawei */ 
 #define NONBE_1122_KEEP_EVS_MODE_UNCHANGED              /* FhG: Disables fix for issue 1122 in EVS mode to keep BE tests green. This switch should be removed once the 1122 fix is added to EVS via a CR.  */
-
+#define NONBE_FIX_1334_EXTREND_OMASA                    /* FhG: issue 1334: fix crash for external split-pre rendering to OMASA */
 
 /* ##################### End NON-BE switches ########################### */
 
diff --git a/lib_rend/lib_rend.c b/lib_rend/lib_rend.c
index ec4f99cd69d2a551771b0f855a802b018db145bb..812b88d44b505a34a4715974bcddb71711614d1e 100644
--- a/lib_rend/lib_rend.c
+++ b/lib_rend/lib_rend.c
@@ -3368,6 +3368,16 @@ static int16_t getCldfbRendFlag(
             numMcInputs += ( hIvasRend->inputsMc[i].base.inConfig == IVAS_AUDIO_CONFIG_INVALID && new_configType != IVAS_REND_AUDIO_CONFIG_TYPE_CHANNEL_BASED ) ? 0 : 1;
         }
 
+#ifdef NONBE_FIX_1334_EXTREND_OMASA
+        if ( ( numMasaInputs > 0 ) || ( numSbaInputs > 0 && hIvasRend->hRendererConfig->split_rend_config.rendererSelection == IVAS_BIN_RENDERER_TYPE_FASTCONV ) )
+        {
+            isCldfbRend = 1;
+        }
+        else if ( numIsmInputs > 0 || numMcInputs > 0 )
+        {
+            isCldfbRend = 0;
+        }
+#else
         if ( numIsmInputs > 0 || numMcInputs > 0 )
         {
             isCldfbRend = 0;
@@ -3376,6 +3386,7 @@ static int16_t getCldfbRendFlag(
         {
             isCldfbRend = 1;
         }
+#endif
     }
 
     return isCldfbRend;
@@ -5629,11 +5640,20 @@ static ivas_error renderInputIsm(
 {
     ivas_error error;
     IVAS_REND_AudioBuffer inAudio;
+#ifdef NONBE_FIX_1334_EXTREND_OMASA
+    int16_t cldfb2tdSampleFact;
+#endif
 
     error = IVAS_ERR_OK;
     inAudio = ismInput->base.inputBuffer;
 
+#ifdef NONBE_FIX_1334_EXTREND_OMASA
+    cldfb2tdSampleFact = outAudio.config.is_cldfb ? 2 : 1;
+    if ( ( ismInput->base.numNewSamplesPerChannel * cldfb2tdSampleFact != outAudio.config.numSamplesPerChannel ) &&
+         ( outConfig != IVAS_AUDIO_CONFIG_BINAURAL_SPLIT_CODED ) && ( outConfig != IVAS_AUDIO_CONFIG_BINAURAL_SPLIT_PCM ) )
+#else
     if ( ismInput->base.numNewSamplesPerChannel != outAudio.config.numSamplesPerChannel )
+#endif
     {
         return IVAS_ERROR( IVAS_ERR_INVALID_BUFFER_SIZE, "Mismatch between the number of input samples vs number of requested output samples - currently not allowed" );
     }