diff --git a/package-lock.json b/package-lock.json
index f156dc70..757ede0b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "odata-v4-server",
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@@ -69,6 +69,12 @@
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@@ -231,18 +237,18 @@
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@@ -262,10 +268,13 @@
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@@ -352,9 +354,9 @@
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@@ -364,9 +366,9 @@
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@@ -392,36 +394,36 @@
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@@ -429,9 +431,9 @@
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@@ -448,24 +450,24 @@
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         "camelcase": {
-          "version": "4.1.0",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
-          "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
+          "version": "5.3.1",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+          "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
           "dev": true
         }
       }
diff --git a/package.json b/package.json
index c15c00d9..7e8c1de2 100644
--- a/package.json
+++ b/package.json
@@ -81,59 +81,59 @@
   "dependencies": {
     "@types/body-parser": "1.17.0",
     "@types/cors": "2.8.4",
-    "@types/express": "^4.16.0",
-    "@types/qs": "^6.5.1",
-    "body-parser": "^1.18.3",
-    "cors": "^2.8.4",
-    "deepmerge": "^2.1.1",
-    "express": "^4.16.3",
+    "@types/express": "^4.17.6",
+    "@types/qs": "^6.9.2",
+    "body-parser": "^1.19.0",
+    "cors": "^2.8.5",
+    "deepmerge": "^2.2.1",
+    "express": "^4.17.1",
     "odata-v4-literal": "^0.1.1",
     "odata-v4-metadata": "^0.1.5",
     "odata-v4-parser": "^0.1.29",
     "odata-v4-service-document": "0.0.3",
     "odata-v4-service-metadata": "^0.1.6",
-    "qs": "^6.5.2",
-    "reflect-metadata": "^0.1.12",
-    "tslib": "^1.9.3"
+    "qs": "^6.9.4",
+    "reflect-metadata": "^0.1.13",
+    "tslib": "^1.11.2"
   },
   "devDependencies": {
     "@types/benchmark": "^1.0.31",
-    "@types/deepmerge": "^2.1.0",
+    "@types/deepmerge": "^2.2.0",
     "@types/event-stream": "^3.3.34",
     "@types/jsonstream": "^0.8.30",
-    "@types/lodash": "^4.14.112",
-    "@types/mocha": "^5.2.5",
+    "@types/lodash": "^4.14.150",
+    "@types/mocha": "^5.2.7",
     "@types/mongodb": "^3.1.1",
-    "@types/node": "^10.5.2",
-    "@types/request": "^2.47.1",
-    "@types/request-promise": "^4.1.42",
-    "@types/stream-buffers": "^3.0.2",
-    "JSONStream": "^1.3.3",
+    "@types/node": "^10.17.21",
+    "@types/request": "^2.48.4",
+    "@types/request-promise": "^4.1.46",
+    "@types/stream-buffers": "^3.0.3",
+    "JSONStream": "^1.3.5",
     "benchmark": "^2.1.4",
-    "chai": "^4.1.2",
-    "copyfiles": "^2.0.0",
-    "event-stream": "^3.3.4",
+    "chai": "^4.2.0",
+    "copyfiles": "^2.2.0",
+    "event-stream": "^3.3.5",
     "istanbul": "^1.1.0-alpha.1",
     "mocha": "^5.2.0",
-    "mochawesome": "^3.0.2",
-    "mongodb": "^3.1.1",
-    "mssql": "^4.1.0",
+    "mochawesome": "^3.1.2",
+    "mongodb": "^3.5.7",
+    "mssql": "^4.3.8",
     "npm-watch": "^0.3.0",
     "nyc": "^12.0.2",
     "odata-v4-inmemory": "^0.1.9",
     "odata-v4-mongodb": "^0.1.12",
     "remap-istanbul": "^0.11.1",
-    "request": "^2.87.0",
-    "request-promise": "^4.2.2",
-    "rimraf": "^2.6.2",
-    "source-map-support": "^0.5.6",
+    "request": "^2.88.2",
+    "request-promise": "^4.2.5",
+    "rimraf": "^2.7.1",
+    "source-map-support": "^0.5.19",
     "stream-buffers": "^3.0.2",
-    "ts-node": "^7.0.0",
-    "tslint": "^5.11.0",
+    "ts-node": "^7.0.1",
+    "tslint": "^5.20.1",
     "typedoc": "^0.11.1",
     "typedoc-default-themes": "^0.5.0",
-    "typedoc-plugin-external-module-name": "^1.1.1",
-    "typescript": "^2.9.2",
-    "xml-beautifier": "^0.4.0"
+    "typedoc-plugin-external-module-name": "^1.1.3",
+    "typescript": "^3.8.3",
+    "xml-beautifier": "^0.4.3"
   }
 }
diff --git a/src/lib/processor.ts b/src/lib/processor.ts
index 422d2f0a..9f5211f5 100644
--- a/src/lib/processor.ts
+++ b/src/lib/processor.ts
@@ -395,7 +395,7 @@ class ODataStreamWrapper extends Transform {
         if (typeof done == "function") done();
     }
 
-    protected _flush(done?: Function) {
+    _flush(done?: Function) {
         if (typeof done == "function") done();
     }
 
@@ -581,7 +581,7 @@ export class ODataProcessor extends Transform {
         }
     }
 
-    protected _flush(done?: Function) {
+    _flush(done?: Function) {
         if (this.streamEnabled && this.streamObject) {
             if (this.options.objectMode) {
                 let flushObject: any = {
@@ -1594,7 +1594,8 @@ export class ODataProcessor extends Transform {
         }
 
         if (filterParam) {
-            let filterAst = queryString;
+            let filterAst;
+            filterAst = queryString;
             let resourceFilterAst = this.resourcePath.ast.value.query && this.resourcePath.ast.value.query.value.options && this.resourcePath.ast.value.query.value.options.find(t => t.type == TokenType.Filter);
             if (typeof filterAst == "string") {
                 filterAst = qs.parse(filterAst).$filter;
diff --git a/src/test/test.model.ts b/src/test/test.model.ts
index de3a18fa..e1c966b6 100644
--- a/src/test/test.model.ts
+++ b/src/test/test.model.ts
@@ -308,7 +308,10 @@ export class MusicController extends ODataController {
 
     @odata.GET.$value
     mp3( @odata.key _: number, @odata.context context: ODataHttpContext) {
-        globalReadableMediaStrBuffer.put(globalWritableMediaStrBuffer.getContents());
+        let contents = globalWritableMediaStrBuffer.getContents();
+        if (contents) {
+            globalReadableMediaStrBuffer.put(contents);
+        }
         return globalReadableMediaStrBuffer.pipe(<Writable>context.response);
     }