diff --git a/features/find.feature b/features/find.feature
index eb27edd..7eb2486 100644
--- a/features/find.feature
+++ b/features/find.feature
@@ -173,6 +173,13 @@ Feature: Find WordPress installs on the filesystem
       """
       @test1:
         path: {TEST_DIR}/subdir2
+      @invalid_empty:
+        path: ''
+      @invalid_non_string:
+        path:
+          - invalid
+      @invalid_group:
+        - @test1
       """
 
     When I run `wp find {TEST_DIR} --fields=version_path,alias`
diff --git a/src/Find_Command.php b/src/Find_Command.php
index 2c1b6c6..674ed18 100644
--- a/src/Find_Command.php
+++ b/src/Find_Command.php
@@ -213,7 +213,7 @@ static function ( $path ) {
 
 		$aliases = WP_CLI::get_runner()->aliases;
 		foreach ( $aliases as $alias => $target ) {
-			if ( empty( $target['path'] ) ) {
+			if ( ! is_array( $target ) || ! isset( $target['path'] ) || ! is_string( $target['path'] ) || '' === $target['path'] ) {
 				continue;
 			}
 			$this->resolved_aliases[ rtrim( Path::normalize( $target['path'] ), '/' ) ] = $alias;