diff --git a/src/database/manager.js b/src/database/manager.js
index 49f0b2d..1263272 100755
--- a/src/database/manager.js
+++ b/src/database/manager.js
@@ -366,7 +366,7 @@ class MediaManager {
                 }
                 const outputKeys = [];
                 for (let i = 0; i < inputKeys.length; i++) {
-                    let field = getField(inputKeys[i]);
+                    const field = getField(inputKeys[i]);
                     if (field) {
                         if (parsedExpression.match(field)) {
                             outputKeys.push(inputKeys[i]);
diff --git a/src/database/search.js b/src/database/search.js
index 1f67f30..a9aa26a 100755
--- a/src/database/search.js
+++ b/src/database/search.js
@@ -19,7 +19,7 @@ class Mutex {
         const $this = this;
         return new Promise(function(resolve, reject) {
             if ($this.locked) {
-                this.clients.push(resolve);
+                $this.clients.push(resolve);
             } else {
                 $this.locked = true;
                 resolve();