diff --git a/src/Type/Php/ImplodeFunctionReturnTypeExtension.php b/src/Type/Php/ImplodeFunctionReturnTypeExtension.php
index 60d268fd4..76afc963c 100644
--- a/src/Type/Php/ImplodeFunctionReturnTypeExtension.php
+++ b/src/Type/Php/ImplodeFunctionReturnTypeExtension.php
@@ -22,6 +22,7 @@
 use function count;
 use function implode;
 use function in_array;
+use const COUNT_RECURSIVE;
 
 final class ImplodeFunctionReturnTypeExtension implements DynamicFunctionReturnTypeExtension
 {
@@ -123,16 +124,16 @@ private function inferConstantType(ConstantArrayType $arrayType, ConstantStringT
 				$arrayValues[] = $constScalars;
 			}
 
+			if (count($strings) + count($arrayValues, COUNT_RECURSIVE) > InitializerExprTypeResolver::CALCULATE_SCALARS_LIMIT) {
+				return null;
+			}
+
 			$combinations = CombinationsHelper::combinations($arrayValues);
 			foreach ($combinations as $combination) {
 				$strings[] = new ConstantStringType(implode($separatorType->getValue(), $combination));
 			}
 		}
 
-		if (count($strings) > InitializerExprTypeResolver::CALCULATE_SCALARS_LIMIT) {
-			return null;
-		}
-
 		return TypeCombinator::union(...$strings);
 	}