fix: Fix getting the keys when data is undefined or empty

Author: Corjen Moll

src/index.js

@@ -108,8 +108,8 @@ class DataSort extends React.Component {
     const { direction } = this.isDirectionControlled() ? this.props : this.state
     const { searchQuery } = this.isSearchControlled() ? this.props : this.state
     const { pages } = this.state
-    const keys = this.props.searchInKeys || Object.keys(data[0])
-
+    const keys = this.props.searchInKeys || data.length ? Object.keys(data[0]) : []
+    console.log({ keys })
     // Search & sort data
     const searched = searchQuery === '' ? data : matchSorter(data, searchQuery, { keys })
     const sorted = sortBy === null ? searched : sortData(searched, sortBy, direction)