Cannot read property 'createTexture' and WebGL: CONTEXT_LOST_WEBGL

I sometimes get two errors in the browser console...

First error

VM31:1 Uncaught TypeError: Cannot read property 'createTexture' of null
at e (eval at embedpanoJS (krpano.js:11), <anonymous>:1:125729)
at eval (eval at embedpanoJS (krpano.js:11), <anonymous>:1:129293)
at g.finish (eval at embedpanoJS (krpano.js:11), <anonymous>:1:45554)
at g.handleEvent (eval at embedpanoJS (krpano.js:11), <anonymous>:1:44763)

Second warning

[.Offscreen-For-WebGL-0000000C432DD540]GL ERROR :GL_OUT_OF_MEMORY : glTexImage2D:
WebGL: CONTEXT_LOST_WEBGL: loseContext: context lost

How can I fix it ?