diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6cb757f..ece67b2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -77,6 +77,7 @@ For major (breaking) changes - **version 4, 3 and 2** - see end of page.
 
 | Version        | Date           | Comment  |
 | -------------- | -------------- | -------- |
+| 5.6.15         | 2021-05-05     | restored Node 4.x compatibility |
 | 5.6.14         | 2021-05-04     | `networkGatewayDefault()` macOS improvement for active VPN |
 | 5.6.13         | 2021-05-04     | `dockerImagesInspect()`, `dockerContainerInspect()`, `dockerContainerProcesses()` security updates |
 | 5.6.12         | 2021-04-09     | `networkinterfaces()` windows detection fix |
diff --git a/docs/history.html b/docs/history.html
index 0c56042..426147b 100644
--- a/docs/history.html
+++ b/docs/history.html
@@ -56,6 +56,11 @@
                   </tr>
                 </thead>
                 <tbody>
+                  <tr>
+                    <th scope="row">5.6.15</th>
+                    <td>2021-05-05</td>
+                    <td>restored Node 4.x compatibility</td>
+                  </tr>
                   <tr>
                     <th scope="row">5.6.14</th>
                     <td>2021-05-04</td>
diff --git a/docs/index.html b/docs/index.html
index 9bb7582..f1075f1 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -170,7 +170,7 @@
       <img class="logo" src="assets/logo.png">
       <div class="title">systeminformation</div>
       <div class="subtitle"><span id="typed"></span>&nbsp;</div>
-      <div class="version">New Version: <span id="version">5.6.14</span></div>
+      <div class="version">New Version: <span id="version">5.6.15</span></div>
       <button class="btn btn-light" onclick="location.href='https://github.com/sebhildebrandt/systeminformation'">View on Github <i class=" fab fa-github"></i></button>
     </div>
     <div class="down">
diff --git a/lib/graphics.js b/lib/graphics.js
index 42e06e2..828269c 100644
--- a/lib/graphics.js
+++ b/lib/graphics.js
@@ -728,7 +728,7 @@ function graphics(callback) {
               const nvidiaData = nvidiaDevices();
               // needs to be rewritten ... using no spread operators
               result.controllers = result.controllers.map((controller) => { // match by busAddress
-                return mergeControllerNvidia(controller, nvidiaData.find(({ pciBus }) => pciBus.toLowerCase().endsWith(controller.busAddress.toLowerCase())) || {});
+                return mergeControllerNvidia(controller, nvidiaData.find((controller) => controller.pciBus.toLowerCase().endsWith(controller.busAddress.toLowerCase())) || {});
               });
             }
             let cmd = 'clinfo --raw';
diff --git a/lib/network.js b/lib/network.js
index 8b475bc..bcfb546 100644
--- a/lib/network.js
+++ b/lib/network.js
@@ -683,12 +683,15 @@ function testVirtualNic(iface, ifaceName, mac) {
   } else { return false; }
 }
 
-function networkInterfaces(callback, rescan = true) {
+function networkInterfaces(callback, rescan) {
 
   if (typeof callback === 'boolean') {
     rescan = callback;
     callback = null;
   }
+  if (typeof rescan === 'undefined') {
+    rescan = true;
+  }
   return new Promise((resolve) => {
     process.nextTick(() => {
       let ifaces = os.networkInterfaces();
diff --git a/lib/util.js b/lib/util.js
index 16f22c3..6b6d5c2 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -540,7 +540,8 @@ function countLines(lines, startingWith) {
   return uniqueLines.length;
 }
 
-function sanitizeShellString(str, strict = false) {
+function sanitizeShellString(str, strict) {
+  if (typeof strict === 'undefined') { strict = false; }
   const s = str || '';
   let result = '';
   for (let i = 0; i <= mathMin(s.length, 2000); i++) {