Index: /trunk/FACT++/gui/FactGui.h
===================================================================
--- /trunk/FACT++/gui/FactGui.h	(revision 11362)
+++ /trunk/FACT++/gui/FactGui.h	(revision 11363)
@@ -1106,5 +1106,7 @@
 	    c->cd();
 
-	    TH1D hist("EventData", "", fEventData->Roi, -0.5, fEventData->Roi-0.5);
+            const int roi = fEventData->Roi>0 ? fEventData->Roi : 1;
+
+	    TH1D hist("EventData", "", roi, -0.5, roi-0.5);
 	    hist.SetStats(kFALSE);
 	    //hist->SetBit(TH1::kNoTitle);
@@ -1130,7 +1132,7 @@
 	h->SetXTitle(str.str().c_str());
 
-	//str.str("");
-	//str << "Crate=" << crate << " Board=" << board << " Channel=" << channel << " [" << d.time() << "]" << endl;
-	//hist->SetTitle(str.str().c_str());
+	// str.str("");
+	// str << "Crate=" << crate << " Board=" << board << " Channel=" << channel << " [" << d.time() << "]" << endl;
+	// hist->SetTitle(str.str().c_str());
 
         const uint32_t p = fAdcChannel->value()+fAdcBoard->value()*36+fAdcCrate->value()*360;