diff --git a/src/Helper/CommandExecutor.php b/src/Helper/CommandExecutor.php
index cac36a7f..b240a27e 100644
--- a/src/Helper/CommandExecutor.php
+++ b/src/Helper/CommandExecutor.php
@@ -295,7 +295,7 @@ public function findBinary($binary, $priorityPath = 'local', $binaryPath = '', $
                     return $existedBinary;
                 }
 
-                if ($existedBinary = $this->findBinaryLocal($composerBin, $bin)) {
+                if (null !== $composerBin && $existedBinary = $this->findBinaryLocal($composerBin, $bin)) {
                     return $existedBinary;
                 }
 
@@ -311,7 +311,7 @@ public function findBinary($binary, $priorityPath = 'local', $binaryPath = '', $
                     return $existedBinary;
                 }
 
-                if ($existedBinary = $this->findBinaryLocal($composerBin, $bin)) {
+                if (null !== $composerBin && $existedBinary = $this->findBinaryLocal($composerBin, $bin)) {
                     return $existedBinary;
                 }
 
@@ -327,7 +327,7 @@ public function findBinary($binary, $priorityPath = 'local', $binaryPath = '', $
                     return $existedBinary;
                 }
 
-                if ($existedBinary = $this->findBinaryLocal($composerBin, $bin)) {
+                if (null !== $composerBin && $existedBinary = $this->findBinaryLocal($composerBin, $bin)) {
                     return $existedBinary;
                 }
 
@@ -339,7 +339,7 @@ public function findBinary($binary, $priorityPath = 'local', $binaryPath = '', $
                     return $existedBinary;
                 }
             } else {
-                if ($existedBinary = $this->findBinaryLocal($composerBin, $bin)) {
+                if (null !== $composerBin && $existedBinary = $this->findBinaryLocal($composerBin, $bin)) {
                     return $existedBinary;
                 }