Deprecated null as array offset in applyReplacements (#1231)

Closes #1228

Author: radimvaculik

src/Traits/TButtonRenderer.php

@@ -82,10 +82,15 @@ public function hasReplacements(): bool
 	public function applyReplacements(Row $row, string $column): array
 	{
 		$value = $row->getValue($column);
+		if (!is_scalar($value) && $value !== null) {
+			return [false, null];
+		}
+
+		// Ensure null is converted to string to avoid deprecation warning
+		$key = gettype($value) === 'double' ? (int) $value : ($value ?? '');
 
-		if ((is_scalar($value) || $value === null) &&
-			isset($this->replacements[gettype($value) === 'double' ? (int) $value : $value])) {
-			return [true, $this->replacements[gettype($value) === 'double' ? (int) $value : $value]];
+		if (isset($this->replacements[$key])) {
+			return [true, $this->replacements[$key]];
 		}
 
 		return [false, null];