diff --git a/src/Psl/Filesystem/canonicalize.php b/src/Psl/Filesystem/canonicalize.php
index ab3404f0..3ee95358 100644
--- a/src/Psl/Filesystem/canonicalize.php
+++ b/src/Psl/Filesystem/canonicalize.php
@@ -14,5 +14,7 @@
  */
 function canonicalize(string $path): ?string
 {
-    return realpath($path) ?: null;
+    $path = realpath($path);
+
+    return false !== $path && '' !== $path ? $path : null;
 }
diff --git a/src/Psl/Str/detect_encoding.php b/src/Psl/Str/detect_encoding.php
index 05c44f3d..074885df 100644
--- a/src/Psl/Str/detect_encoding.php
+++ b/src/Psl/Str/detect_encoding.php
@@ -25,7 +25,10 @@ function detect_encoding(string $string, ?array $encoding_list = null): ?Encodin
         );
     }
 
-    $encoding = mb_detect_encoding($string, $encoding_list, true) ?: null;
+    $encoding = mb_detect_encoding($string, $encoding_list, true);
+    if ($encoding === false) {
+        return null;
+    }
 
-    return null === $encoding ? $encoding : Encoding::from($encoding);
+    return Encoding::from($encoding);
 }