Null check operator used on a null value

[mohamedshasho]

Hello, This issue was reported via Crashlytics

`  Fatal Exception: io.flutter.plugins.firebase.crashlytics.FlutterError: Null check operator used on a null value
   at State.context(framework.dart:958)
   at _JustTheTooltipOverlayState._createNewEntries(just_the_tooltip.dart:197)
   at _JustTheTooltipOverlayState.ensureTooltipVisible(just_the_tooltip.dart:176)
  at JustTheTooltipState._showTooltip.<fn>(just_the_tooltip.dart:508)
`

- > final tooltipController = JustTheController();
- > tooltipController.showTooltip(autoClose: true);
- > 
- > JustTheTooltip(
- >           controller: controller.tooltipController,
- >           tailBaseWidth: 15,
- >           showDuration: const Duration(seconds: 3),
- >           triggerMode: TooltipTriggerMode.manual,
- >           backgroundColor: tertiaryColor,
- >           elevation: 2,
- >           borderRadius: const BorderRadius.all(Radius.circular(20)),
- >           content: DefaultContainer(
- >             padding: const EdgeInsets.all(10.0),
- >             radius: 10,
- >             gradient: LinearGradient(
- >               colors: [
- >                 tertiaryColor,
- >                 primaryColor,
- >               ],
- >               begin: Alignment.topCenter,
- >               end: Alignment.bottomCenter,
- >             ),
- >             child: Text(
- >               LocaleKeys.item_added_to_cart.tr,
- >               style: Theme.of(context).textTheme.bodySmall,
- >             ),
- >           ),
- >           child: IconButton(
- >             onPressed: () => Get.toNamed(Routes.cart),
- >             icon: Obx(
- >               () => badges.Badge(
- >                 showBadge: controller.cartCount > 0,
- >                 badgeContent: Text(controller.cartCount.toString()),
- >                 position: badges.BadgePosition.bottomEnd(),
- >                 badgeStyle: badges.BadgeStyle(
- >                   badgeColor: secondaryColor,
- >                   elevation: 0,
- >                 ),
- >                 child: SvgPicture.asset("assets/icons/cart.svg"),
- >               ),
- >             ),
- >           ),
- >         ),