A DESCRIPTION OF THE PROBLEM :
My application uses multiple Canvas components to render diagrams, using Graphics.
When there are more diagram open, I got this exception:

java.lang.NullPointerException: Cannot invoke "com.sun.prism.d3d.D3DTextureData.getContext()" because the return value of "com.sun.prism.d3d.D3DTextureResource.getResource()" is null
at com.sun.prism.d3d.D3DTexture.getContext(D3DTexture.java:85)
at com.sun.prism.d3d.D3DTexture.update(D3DTexture.java:210)
at com.sun.prism.d3d.D3DTexture.update(D3DTexture.java:154)
at com.sun.prism.impl.BaseContext.flushMask(BaseContext.java:115)
at com.sun.prism.impl.BaseContext.drawQuads(BaseContext.java:124)
at com.sun.prism.impl.VertexBuffer.flush(VertexBuffer.java:98)
at com.sun.prism.impl.BaseContext.flushVertexBuffer(BaseContext.java:107)
at com.sun.prism.impl.ps.BaseShaderContext.setRenderTarget(BaseShaderContext.java:789)
at com.sun.prism.impl.BaseContext.setRenderTarget(BaseContext.java:149)
at com.sun.prism.impl.BaseGraphics.<init>(BaseGraphics.java:107)
at com.sun.prism.impl.ps.BaseShaderGraphics.<init>(BaseShaderGraphics.java:86)
at com.sun.prism.d3d.D3DGraphics.<init>(D3DGraphics.java:40)
at com.sun.prism.d3d.D3DGraphics.create(D3DGraphics.java:63)
at com.sun.prism.d3d.D3DRTTexture.createGraphics(D3DRTTexture.java:80)
at com.sun.prism.d3d.D3DResourceFactory.createRTTexture(D3DResourceFactory.java:329)
at com.sun.prism.d3d.D3DResourceFactory.createRTTexture(D3DResourceFactory.java:281)
at com.sun.prism.d3d.D3DResourceFactory.createRTTexture(D3DResourceFactory.java:63)
at com.sun.javafx.sg.prism.NGCanvas$RenderBuf.validate(NGCanvas.java:212)
at com.sun.javafx.sg.prism.NGCanvas.initCanvas(NGCanvas.java:644)
at com.sun.javafx.sg.prism.NGCanvas.renderForcedContent(NGCanvas.java:628)
at com.sun.javafx.sg.prism.NGGroup.renderForcedContent(NGGroup.java:232)
at com.sun.javafx.sg.prism.NGGroup.renderForcedContent(NGGroup.java:232)
at com.sun.javafx.sg.prism.NGGroup.renderForcedContent(NGGroup.java:232)
at com.sun.javafx.sg.prism.NGGroup.renderForcedContent(NGGroup.java:232)
at com.sun.javafx.sg.prism.NGGroup.renderForcedContent(NGGroup.java:232)
at com.sun.javafx.sg.prism.NGGroup.renderForcedContent(NGGroup.java:232)
at com.sun.javafx.sg.prism.NGGroup.renderForcedContent(NGGroup.java:232)
at com.sun.javafx.sg.prism.NGGroup.renderForcedContent(NGGroup.java:232)
at com.sun.javafx.sg.prism.NGGroup.renderForcedContent(NGGroup.java:232)
at com.sun.javafx.sg.prism.NGGroup.renderForcedContent(NGGroup.java:232)
at com.sun.javafx.tk.quantum.ViewPainter.paintImpl(ViewPainter.java:331)
at com.sun.javafx.tk.quantum.PresentingPainter.run(PresentingPainter.java:92)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)



FREQUENCY : always