diff --git a/atom/browser/api/atom_api_web_contents.cc b/atom/browser/api/atom_api_web_contents.cc
index 561d75eeb63d..a5aa18f24ee6 100644
--- a/atom/browser/api/atom_api_web_contents.cc
+++ b/atom/browser/api/atom_api_web_contents.cc
@@ -1354,7 +1354,7 @@ void WebContents::OnPaint(const gfx::Rect& dirty_rect,
   mate::Dictionary dict = mate::Dictionary::CreateEmpty(isolate());
   dict.Set("width", bitmap_size.width());
   dict.Set("height", bitmap_size.height());
-  dict.Set("pixel", pixel_size);
+  dict.Set("bytesPerPixel", pixel_size);
 
   if (!buffer.IsEmpty())
     Emit("paint", dirty_rect, buffer.ToLocalChecked(), dict);
diff --git a/atom/browser/osr/osr_render_widget_host_view.cc b/atom/browser/osr/osr_render_widget_host_view.cc
index 2f6d02659ee8..ecb8c6628ec3 100644
--- a/atom/browser/osr/osr_render_widget_host_view.cc
+++ b/atom/browser/osr/osr_render_widget_host_view.cc
@@ -381,11 +381,11 @@ OffScreenRenderWidgetHostView::~OffScreenRenderWidgetHostView() {
 #endif
 
   if (copy_frame_generator_.get())
-    copy_frame_generator_.reset(NULL);
+    copy_frame_generator_.reset(nullptr);
 
-  delegated_frame_host_.reset(NULL);
-  compositor_.reset(NULL);
-  root_layer_.reset(NULL);
+  delegated_frame_host_.reset(nullptr);
+  compositor_.reset(nullptr);
+  root_layer_.reset(nullptr);
 }
 
 void OffScreenRenderWidgetHostView::OnBeginFrameTimerTick() {
diff --git a/docs/api/web-contents.md b/docs/api/web-contents.md
index a7428e38223c..1f3d9cbf4100 100644
--- a/docs/api/web-contents.md
+++ b/docs/api/web-contents.md
@@ -471,7 +471,7 @@ Returns:
 * `bitmapSize` Object
   * `width` Number - the width of the whole bitmap
   * `height` Number - the height of the whole bitmap
-  * `pixel` Number - The number of bytes per pixel
+  * `bytesPerPixel` Number - The number of bytes per pixel in the bitmap
 
 Emitted when a new frame is generated. Only the dirty area is passed in the
 buffer.