diff --git a/src/ChromeDriver.php b/src/ChromeDriver.php
index 3facc8a..38667e0 100644
--- a/src/ChromeDriver.php
+++ b/src/ChromeDriver.php
@@ -144,7 +144,6 @@ public function start()
         }
 
         if (isset($this->options['validateCertificate']) && $this->options['validateCertificate'] === false) {
-            $this->page->send('Security.enable');
             $this->page->send('Security.setIgnoreCertificateErrors', ['ignore' => true]);
         }
     }
@@ -239,8 +238,10 @@ public function reset()
         }
         $this->switchToWindow($this->main_window);
         $this->page->reset();
-        $this->request_headers = [];
-        $this->sendRequestHeaders();
+        if ($this->request_headers !== []) {
+            $this->request_headers = [];
+            $this->sendRequestHeaders();
+        }
     }
 
     /**
diff --git a/src/ChromePage.php b/src/ChromePage.php
index e6c9d24..e441d2b 100644
--- a/src/ChromePage.php
+++ b/src/ChromePage.php
@@ -44,7 +44,6 @@ public function connect($url = null): void
         $this->send('Page.enable');
         $this->send('DOM.enable');
         $this->send('Network.enable');
-        $this->send('Animation.enable');
         $this->send('Animation.setPlaybackRate', ['playbackRate' => 100000]);
         $this->send('Console.enable');
     }
@@ -232,20 +231,6 @@ protected function processResponse(array $data): bool
                     break;
                 case 'Inspector.targetCrashed':
                     throw new DriverException('Browser crashed');
-                case 'Animation.animationStarted':
-                    if (!empty($data['params']['source']['duration'])) {
-                        usleep($data['params']['source']['duration'] * 10);
-                    }
-                    break;
-                case 'Security.certificateError':
-                    if (isset($data['params']['eventId'])) {
-                        $this->send(
-                            'Security.handleCertificateError',
-                            ['eventId' => $data['params']['eventId'], 'action' => 'continue']
-                        );
-                        $this->page_ready = false;
-                    }
-                    break;
                 case 'Console.messageAdded':
                     $this->console_messages[] = $data['params']['message'];
                     break;
diff --git a/src/DevToolsConnection.php b/src/DevToolsConnection.php
index 8609822..aa98bb6 100644
--- a/src/DevToolsConnection.php
+++ b/src/DevToolsConnection.php
@@ -147,7 +147,12 @@ protected function waitFor(callable $is_ready)
             }
 
             if (is_null($response)) {
-                return null;
+                // There seems to be no valid case where we could actually get an explicit `null` value from the
+                // underlying websocket, other than perhaps the socket being closed by Chrome. Certainly, calling code
+                // (which does not generally check the response) should not blindly continue at this point.
+                throw new DriverException(
+                    'Received unexpected NULL payload from Chrome websocket'
+                );
             }
 
             if ($data = json_decode($response, true)) {