diff --git a/core/views/caves.py b/core/views/caves.py
index 0e4b4e8..145aeb2 100644
--- a/core/views/caves.py
+++ b/core/views/caves.py
@@ -483,7 +483,7 @@ def qm(request,cave_id,qm_id,year,grade=None, blockname=None):
     
     year=int(year)
     
-    if blockname == '':
+    if blockname == '' or not blockname:
         # CSV import QMs, use old technique
         try:
             c=getCave(cave_id)
@@ -492,7 +492,7 @@ def qm(request,cave_id,qm_id,year,grade=None, blockname=None):
             return render(request,'qm.html', {'qm': qm})
         except QM.DoesNotExist:
             #raise
-            return render(request,'errors/badslug.html', {'badslug': f'{cave_id=} {year=} {qm_id=} {blockname=}'})
+            return render(request,'errors/badslug.html', {'badslug': f'QM.DoesNotExist blockname is empty string: {cave_id=} {year=} {qm_id=} {grade=} {blockname=}'})
 
     else:
         try:
@@ -513,13 +513,13 @@ def qm(request,cave_id,qm_id,year,grade=None, blockname=None):
                     return render(request,'qm.html', {'qm': qm})
                 else:
                     #raise
-                    return render(request,'errors/badslug.html', {'badslug': f'{cave_id=} {year=} {qm_id=} {blockname=}'})
+                    return render(request,'errors/badslug.html', {'badslug': f'Failed get {cave_id=} {year=} {qm_id=} {grade=} {blockname=}'})
         except MultipleObjectsReturned:
             message = f'Multiple QMs with the same cave, year, number, grade AND first 8 chars of the survexblock name. (Could be caused by incomplete databasereset). Fix this in the survex file(s). {cave_id=} {year=} {qm_id=} {blockname=}'
             return render(request,'errors/generic.html', {'message': message})
         except QM.DoesNotExist:
            #raise
-           return render(request,'errors/badslug.html', {'badslug': f'{cave_id=} {year=} {qm_id=} {blockname=}'})
+           return render(request,'errors/badslug.html', {'badslug': f'QM.DoesNotExist blockname is not empty string {cave_id=} {year=} {qm_id=} {grade=} {blockname=}'})
 
  
 # def get_qms(request, caveslug):