diff --git a/src/renderers/Chart.tsx b/src/renderers/Chart.tsx
index 231120817..c80092b4c 100644
--- a/src/renderers/Chart.tsx
+++ b/src/renderers/Chart.tsx
@@ -124,11 +124,7 @@ export class Chart extends React.Component<ChartProps> {
 
         if (query) {
             return this.receive(query);
-        } else if (!env || !env.fetcher || !api) {
-            return;
-        }
-
-        if (!isEffectiveApi(api, store.data)) {
+        } else if (!env || !env.fetcher || !isEffectiveApi(api, store.data)) {
             return;
         }
 
diff --git a/src/renderers/Form/ChainedSelect.tsx b/src/renderers/Form/ChainedSelect.tsx
index 4fc701913..e0c21562c 100644
--- a/src/renderers/Form/ChainedSelect.tsx
+++ b/src/renderers/Form/ChainedSelect.tsx
@@ -102,7 +102,7 @@ export default class ChainedSelectControl extends React.Component<ChainedSelectP
             stack
         }, () => {
             env
-                .fetcher(source, {
+                .fetcher(source as Api, {
                     ...data,
                     value: arr,
                     level: idx + 1,
diff --git a/src/renderers/Nav.tsx b/src/renderers/Nav.tsx
index 6026e963c..8234eb324 100644
--- a/src/renderers/Nav.tsx
+++ b/src/renderers/Nav.tsx
@@ -120,7 +120,7 @@ export default class Navigation extends React.Component<NavigationProps, Navigat
             return;
         }
 
-        env.fetcher(source, finalData)
+        env.fetcher(source as Api, finalData)
             .then(payload => {
                 if (!this.mounted) {
                     return;