diff --git a/src/pocketmine/level/format/io/region/RegionLoader.php b/src/pocketmine/level/format/io/region/RegionLoader.php
index 14e6c9aa2..05eb3eb5d 100644
--- a/src/pocketmine/level/format/io/region/RegionLoader.php
+++ b/src/pocketmine/level/format/io/region/RegionLoader.php
@@ -265,8 +265,8 @@ class RegionLoader{
 		fseek($this->filePointer, 0);
 
 		$headerRaw = fread($this->filePointer, self::REGION_HEADER_LENGTH);
-		if(($len = strlen($headerRaw)) !== self::REGION_HEADER_LENGTH){
-			throw new CorruptedRegionException("Invalid region file header, expected " . self::REGION_HEADER_LENGTH . " bytes, got " . $len . " bytes");
+		if($headerRaw === false or strlen($headerRaw) !== self::REGION_HEADER_LENGTH){
+			throw new CorruptedRegionException("Corrupted region header (unexpected end of file)");
 		}
 
 		$data = unpack("N*", $headerRaw);
diff --git a/tests/phpstan/configs/l7-baseline.neon b/tests/phpstan/configs/l7-baseline.neon
index d4ebd2bff..eb84dc9a9 100644
--- a/tests/phpstan/configs/l7-baseline.neon
+++ b/tests/phpstan/configs/l7-baseline.neon
@@ -780,16 +780,6 @@ parameters:
 			count: 1
 			path: ../../../src/pocketmine/level/format/io/region/RegionLoader.php
 
-		-
-			message: "#^Parameter \\#1 \\$string of function strlen expects string, string\\|false given\\.$#"
-			count: 1
-			path: ../../../src/pocketmine/level/format/io/region/RegionLoader.php
-
-		-
-			message: "#^Parameter \\#2 \\$data of function unpack expects string, string\\|false given\\.$#"
-			count: 1
-			path: ../../../src/pocketmine/level/format/io/region/RegionLoader.php
-
 		-
 			message: "#^Parameter \\#1 \\$start of method pocketmine\\\\utils\\\\Random\\:\\:nextRange\\(\\) expects int, float\\|int given\\.$#"
 			count: 2