Minor fix to operator check
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@ -3623,7 +3623,7 @@ class Calculation
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// If the last entry on the stack was a : operator, then we have a cell range reference
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$testPrevOp = $stack->last(1);
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if ($testPrevOp['value'] == ':') {
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if ($testPrevOp !== null && $testPrevOp['value'] == ':') {
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// If we have a worksheet reference, then we're playing with a 3D reference
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if ($matches[2] == '') {
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// Otherwise, we 'inherit' the worksheet reference from the start cell reference
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