diff --git a/python3/vimspector/stack_trace.py b/python3/vimspector/stack_trace.py
index aefb74d..4358e94 100644
--- a/python3/vimspector/stack_trace.py
+++ b/python3/vimspector/stack_trace.py
@@ -62,6 +62,10 @@ class StackTraceView( object ):
     def consume_threads( message ):
       self._threads.clear()
 
+      if not message[ 'body' ][ 'threads' ]:
+        # This is a protocol error. It is required to return at least one!
+        raise ValueError( 'Server returned no threads. Is it running?' )
+
       for thread in message[ 'body' ][ 'threads' ]:
         self._threads.append( thread )
 
diff --git a/python3/vimspector/variables.py b/python3/vimspector/variables.py
index de53f48..c83bf44 100644
--- a/python3/vimspector/variables.py
+++ b/python3/vimspector/variables.py
@@ -179,7 +179,7 @@ class VariablesView( object ):
                           '_variables' not in variable ) else '-',
           name = variable[ 'name' ],
           type_ = variable.get( 'type', '<unknown type>' ),
-          value = variable[ 'value' ] ).split( '\n' ) )
+          value = variable.get( 'value', '<unknown value>' ) ).split( '\n' ) )
 
       if '_variables' in variable:
         self._DrawVariables( variable[ '_variables' ], indent + 2 )