Pause button of debugger throws NPE

[stevemessick]

Start a flutter app, hit a breakpoint, click Continue, then click the Pause button (two blue vertical bars) in the left tool bar.

java.lang.NullPointerException
at com.jetbrains.lang.dart.ide.runner.server.vmService.DartVmServiceDebugProcess.startPausing(DartVmServiceDebugProcess.java:344)
at com.intellij.xdebugger.impl.XDebugSessionImpl.pause(XDebugSessionImpl.java:523)
at com.intellij.xdebugger.impl.actions.handlers.XDebuggerPauseActionHandler.perform(XDebuggerPauseActionHandler.java:31)
at com.intellij.xdebugger.impl.actions.handlers.XDebuggerActionHandler.perform(XDebuggerActionHandler.java:34)
at com.intellij.xdebugger.impl.actions.XDebuggerActionBase.perform(XDebuggerActionBase.java:100)
at com.intellij.xdebugger.impl.actions.XDebuggerActionBase.performWithHandler(XDebuggerActionBase.java:92)
at com.intellij.xdebugger.impl.actions.XDebuggerActionBase.actionPerformed(XDebuggerActionBase.java:81)
at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:199)
at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:215)
at com.intellij.openapi.actionSystem.impl.ActionButton.actionPerformed(ActionButton.java:188)
at com.intellij.openapi.actionSystem.impl.ActionButton.performAction(ActionButton.java:154)
at com.intellij.openapi.actionSystem.impl.ActionButton.processMouseEvent(ActionButton.java:325)