diff --git a/dom/canvas/WebGL2ContextMRTs.cpp b/dom/canvas/WebGL2ContextMRTs.cpp
index 107cf303f1be..d4803bc09667 100644
--- a/dom/canvas/WebGL2ContextMRTs.cpp
+++ b/dom/canvas/WebGL2ContextMRTs.cpp
@@ -94,6 +94,10 @@ WebGL2Context::ClearBufferfv_base(GLenum buffer, GLint drawbuffer, const GLfloat
 void
 WebGL2Context::ClearBufferiv(GLenum buffer, GLint drawbuffer, const dom::Int32Array& value)
 {
+    if (IsContextLost()) {
+        return;
+    }
+
     value.ComputeLengthAndData();
     if (!ValidateClearBuffer("clearBufferiv", buffer, drawbuffer, value.Length())) {
         return;
@@ -105,6 +109,10 @@ WebGL2Context::ClearBufferiv(GLenum buffer, GLint drawbuffer, const dom::Int32Ar
 void
 WebGL2Context::ClearBufferiv(GLenum buffer, GLint drawbuffer, const dom::Sequence<GLint>& value)
 {
+    if (IsContextLost()) {
+        return;
+    }
+
     if (!ValidateClearBuffer("clearBufferiv", buffer, drawbuffer, value.Length())) {
         return;
     }
@@ -115,6 +123,10 @@ WebGL2Context::ClearBufferiv(GLenum buffer, GLint drawbuffer, const dom::Sequenc
 void
 WebGL2Context::ClearBufferuiv(GLenum buffer, GLint drawbuffer, const dom::Uint32Array& value)
 {
+    if (IsContextLost()) {
+        return;
+    }
+
     value.ComputeLengthAndData();
     if (!ValidateClearBuffer("clearBufferuiv", buffer, drawbuffer, value.Length())) {
         return;
@@ -126,6 +138,10 @@ WebGL2Context::ClearBufferuiv(GLenum buffer, GLint drawbuffer, const dom::Uint32
 void
 WebGL2Context::ClearBufferuiv(GLenum buffer, GLint drawbuffer, const dom::Sequence<GLuint>& value)
 {
+    if (IsContextLost()) {
+        return;
+    }
+
     if (!ValidateClearBuffer("clearBufferuiv", buffer, drawbuffer, value.Length())) {
         return;
     }
@@ -136,6 +152,10 @@ WebGL2Context::ClearBufferuiv(GLenum buffer, GLint drawbuffer, const dom::Sequen
 void
 WebGL2Context::ClearBufferfv(GLenum buffer, GLint drawbuffer, const dom::Float32Array& value)
 {
+    if (IsContextLost()) {
+        return;
+    }
+
     value.ComputeLengthAndData();
     if (!ValidateClearBuffer("clearBufferfv", buffer, drawbuffer, value.Length())) {
         return;
@@ -147,6 +167,10 @@ WebGL2Context::ClearBufferfv(GLenum buffer, GLint drawbuffer, const dom::Float32
 void
 WebGL2Context::ClearBufferfv(GLenum buffer, GLint drawbuffer, const dom::Sequence<GLfloat>& value)
 {
+    if (IsContextLost()) {
+        return;
+    }
+
     if (!ValidateClearBuffer("clearBufferfv", buffer, drawbuffer, value.Length())) {
         return;
     }
@@ -157,6 +181,10 @@ WebGL2Context::ClearBufferfv(GLenum buffer, GLint drawbuffer, const dom::Sequenc
 void
 WebGL2Context::ClearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, GLint stencil)
 {
+    if (IsContextLost()) {
+        return;
+    }
+
     if (buffer != LOCAL_GL_DEPTH_STENCIL) {
         return ErrorInvalidEnumInfo("clearBufferfi: buffer", buffer);
     }