diff --git a/slsDetectorSoftware/slsDetector/slsDetectorUtils.cpp b/slsDetectorSoftware/slsDetector/slsDetectorUtils.cpp
index 3003c8102..8bb16fe0e 100644
--- a/slsDetectorSoftware/slsDetector/slsDetectorUtils.cpp
+++ b/slsDetectorSoftware/slsDetector/slsDetectorUtils.cpp
@@ -342,7 +342,6 @@ int  slsDetectorUtils::acquire(int delflag){
 
 	  pthread_mutex_lock(&mg);
 	  //offline
-	  pthread_mutex_lock(&mg);
 	  if(setReceiverOnline()==OFFLINE_FLAG){
 		  if ((getDetectorsType()==GOTTHARD) || (getDetectorsType()==MOENCH) || (getDetectorsType()==JUNGFRAU) ){
 			  if((*correctionMask)&(1<<WRITE_FILE))