// RunspaceRef used before null check
- if (_isRunspacePushed)
-     return RunspaceRef.OldRunspace as LocalRunspace;
- if (RunspaceRef == null) return null;
+ if (RunspaceRef == null) return null;
+ if (_isRunspacePushed)
+     return RunspaceRef.OldRunspace as LocalRunspace;

  CimInstance instance = GetCimInstanceParameter(cmdlet);
- nameSpace = instance.CimSystemProperties.Namespace;
+ if (instance != null)
+ {
+     nameSpace = instance.CimSystemProperties.Namespace;
+     ...
+ }

  // vd.mainControl accessed when vd == null
- if (vd == null || mainControlType != vd.mainControl.GetType())
- {
-     ActiveTracer.WriteLine("NOT MATCH ...",
-         ControlBase.GetControlShapeName(vd.mainControl), ...);
- }
+ if (vd == null)
+ {
+     ActiveTracer.WriteLine("NOT MATCH null view definition");
+     continue;
+ }
+ if (mainControlType != vd.mainControl.GetType())
+ {
+     ActiveTracer.WriteLine("NOT MATCH ...", ...);
+     continue;
+ }

  // ?? has lower priority than +
- int capacity = length + prependStr?.Length ?? 0 + appendStr?.Length ?? 0;
+ int capacity = length + (prependStr?.Length ?? 0) + (appendStr?.Length ?? 0);

- this.Module = other.Members["Module"].Value as ShowCommandModuleInfo;
+ this.Module = other.Members["Module"]?.Value as ShowCommandModuleInfo;

- private static bool logInitialized = false;
+ private static volatile bool logInitialized = false;