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There seems to be some exceptions with mouse tracking if it leaves the chart area/window while a tooltip is displayed. I think there is some other ways to duplicate similar exceptions but this one is the most common for me.

════════ Exception caught by gesture library ═══════════════════════════════════════════════════════
The following JSNoSuchMethodError was thrown while routing a pointer event:
NoSuchMethodError: invalid member on null: 'hide'

When the exception was thrown, this was the stack:
packages/syncfusion_flutter_charts/src/common/user_interaction/tooltip.dart 543:39                                     hideMouseTooltip
packages/syncfusion_flutter_charts/src/common/user_interaction/tooltip.dart 617:44                                     onExit
packages/syncfusion_flutter_charts/src/chart/base/chart_base.dart 2421:29                                              [_performMouseExit]
packages/syncfusion_flutter_charts/src/chart/base/chart_base.dart 2544:41                                              
packages/flutter/src/widgets/basic.dart 6131:20                                                                        handleExit
Event: PointerHoverEvent#8587f(position: Offset(301.6, 17.6))
  position: Offset(301.6, 17.6)

════════ (2) Exception caught by scheduler library ═════════════════════════════════════════════════
Assertion failed: file:///C:/Users/Brayden/Documents/SDK/flutter/packages/flutter/lib/src/rendering/mouse_tracking.dart:452:12
is not true

Flutter SDK Beta Channel

Version: 1.17.0 

Release: 4/6/2020