diff --git a/src/core/plugins/oas3/spec-extensions/wrap-selectors.js b/src/core/plugins/oas3/spec-extensions/wrap-selectors.js
index d4808d0c..82c10f21 100644
--- a/src/core/plugins/oas3/spec-extensions/wrap-selectors.js
+++ b/src/core/plugins/oas3/spec-extensions/wrap-selectors.js
@@ -72,10 +72,10 @@ export const servers = onlyOAS3(createSelector(
 
 export const isOAS3 = (ori, system) => () => {
   const spec = system.getSystem().specSelectors.specJson()
-  return isOAS3Helper(spec)
+  return isOAS3Helper(Map.isMap(spec) ? spec : Map())
 }
 
 export const isSwagger2 = (ori, system) => () => {
   const spec = system.getSystem().specSelectors.specJson()
-  return isSwagger2Helper(spec)
+  return isSwagger2Helper(Map.isMap(spec) ? spec : Map())
 }
diff --git a/src/core/plugins/spec/actions.js b/src/core/plugins/spec/actions.js
index 6ec1ed9c..6b6324ce 100644
--- a/src/core/plugins/spec/actions.js
+++ b/src/core/plugins/spec/actions.js
@@ -68,7 +68,7 @@ export const parseToJson = (str) => ({specActions, specSelectors, errActions}) =
       line: e.mark && e.mark.line ? e.mark.line + 1 : undefined
     })
   }
-  if(json) {
+  if(json && typeof json === "object") {
     return specActions.updateJsonSpec(json)
   }
   return {}