Minor fix to operator check

iwf-web · Sep 20, 2019 · f7d2eba · f7d2eba
1 parent a691516
commit f7d2eba
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/PhpSpreadsheet/Calculation/Calculation.php b/src/PhpSpreadsheet/Calculation/Calculation.php
@@ -3623,7 +3623,7 @@ private function _parseFormula($formula, Cell $pCell = null)
 
                     //    If the last entry on the stack was a : operator, then we have a cell range reference
                     $testPrevOp = $stack->last(1);
-                    if ($testPrevOp['value'] == ':') {
+                    if ($testPrevOp !== null && $testPrevOp['value'] == ':') {
                         //    If we have a worksheet reference, then we're playing with a 3D reference
                         if ($matches[2] == '') {
                             //    Otherwise, we 'inherit' the worksheet reference from the start cell reference