Add strict typing

Except for functions because of https://github.com/reactjs/redux/issues/2709

1 files changed, 1 insertions, 1 deletions

diff --git a/src/client/react/reducers/search.ts b/src/client/react/reducers/search.ts
index 658d3ca..470e650 100644
--- a/src/client/react/reducers/search.ts
+++ b/src/client/react/reducers/search.ts
@@ -61,7 +61,7 @@ const search = (state = DEFAULT_STATE, action: Action): State => {
       if (isExactMatch) return state;
 
       const prevSelectedResult = state.selectedResult;
-      const prevSelectedResultIndex = results.indexOf(prevSelectedResult);
+      const prevSelectedResultIndex = prevSelectedResult ? results.indexOf(prevSelectedResult) : -1;
       let nextSelectedResultIndex =
         prevSelectedResultIndex + action.relativeChange;