diff --git a/backend/package-lock.json b/backend/package-lock.json
new file mode 100644
index 000000000..6052b4260
--- /dev/null
+++ b/backend/package-lock.json
@@ -0,0 +1,1262 @@
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+        "punycode": "^2.1.0"
+      }
+    },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
+    },
+    "uuid": {
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.4.0.tgz",
+      "integrity": "sha512-HjSDRw6gZE5JMggctHBcjVak08+KEVhSIiDzFnT9S9aegmp85S/bReBVTb4QTFaRNptJ9kuYaNhnbNEOkbKb/A=="
+    },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw="
+    },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "requires": {
+        "assert-plus": "^1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "^1.2.0"
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "ws": {
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.3.1.tgz",
+      "integrity": "sha512-D3RuNkynyHmEJIpD2qrgVkc9DQ23OrN/moAwZX4L8DfvszsJxpjQuUq3LMx6HoYji9fbIOBY18XWBsAux1ZZUA=="
+    },
+    "yallist": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
+      "integrity": "sha512-a4UGQaWPH59mOXUYnAG2ewncQS4i4F43Tv3JoAM+s2VDAmS9NsK8GpDMLrCHPksFT7h3K6TOoUNn2pb7RoXx4g=="
+    }
+  }
+}
diff --git a/backend/package.json b/backend/package.json
index 069518888..884a9fb90 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -36,7 +36,7 @@
     "@types/express": "^4.17.2",
     "@types/request": "^2.48.2",
     "@types/ws": "^6.0.4",
-    "tslint": "^5.11.0",
-    "typescript": "^3.6.4"
+    "tslint": "~6.1.0",
+    "typescript": "~3.9.7"
   }
 }
diff --git a/backend/src/routes.ts b/backend/src/routes.ts
index dc304020f..c8ef0dca5 100644
--- a/backend/src/routes.ts
+++ b/backend/src/routes.ts
@@ -109,14 +109,15 @@ class Routes {
 
   public getBisqTransactions(req: Request, res: Response) {
     const types: string[] = [];
-    if (req.query.types && !Array.isArray(req.query.types)) {
+    req.query.types = req.query.types || [];
+    if (!Array.isArray(req.query.types)) {
       res.status(500).send('Types is not an array');
       return;
-    } else {
-      for (const _type in req.query.types) {
-        if (typeof req.query.types[_type] === 'string') {
-          types.push(req.query.types[_type].toString());
-        }
+    }
+
+    for (const _type in req.query.types) {
+      if (typeof req.query.types[_type] === 'string') {
+        types.push(req.query.types[_type].toString());
       }
     }