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TypeError: Object doesn't support property or method 'isNaN' #6702

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nithusha21 opened this issue May 5, 2019 · 2 comments
Closed

TypeError: Object doesn't support property or method 'isNaN' #6702

nithusha21 opened this issue May 5, 2019 · 2 comments
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@nithusha21
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This error occurred recently in production

TypeError: Object doesn't support property or method 'isNaN'
at exports.equals (math-expressions.js:7409)
at exports.equals (math-expressions.js:7575)
at IsMathematicallyEquivalentTo (https://www.oppia.org/build/extensions/interactions/MathExpressionInput/directives/MathExpressionInputRulesService.fc02cea628397d8bb10bbd3d96b4c6c8.js:1)
at a (https://www.oppia.org/build/templates/head/pages/exploration_player/AnswerClassificationService.4ebb539509f632cdd38bb73142bcbf47.js:1)
at getMatchingClassificationResult (https://www.oppia.org/build/templates/head/pages/exploration_player/AnswerClassificationService.4ebb539509f632cdd38bb73142bcbf47.js:1)
at submitAnswer (https://www.oppia.org/build/templates/head/pages/exploration_player/ExplorationEngineService.5c3a069e7efcdf63abff46d99d85edab.js:1)
at C.submitAnswer (https://www.oppia.org/build/templates/head/pages/exploration_player/ConversationSkinDirective.366b6b07faea66a6af19f5bc2d95cc1d.js:1)
at onSubmit (https://www.oppia.org/build/templates/head/pages/exploration_player/CurrentInteractionService.7094b81f92482b553e5f9f51e8ed892d.js:1)
at q.submitAnswer (OppiaInteractiveMathExpressionInputDirective.71b319b4f78d26f5cb8150aea70331be.js:1)
at submitAnswer (https://www.oppia.org/build/templates/head/pages/exploration_player/CurrentInteractionService.7094b81f92482b553e5f9f51e8ed892d.js:1)

General instructions
There are no specific repro steps available for this bug report. The general procedure to fix server errors should be the following:

  • Analyze the code in the file where the error occurred and come up with a hypothesis for the reason.
  • Get the logic of the proposed fix validated by an Oppia team member (have this discussion on the issue thread).
  • Make a PR that fixes the issue, then close the issue on merging the PR. (If the error reoccurs in production, the issue will be reopened for further investigation.)
@nithusha21
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This seems to occur when answer.latex is NaN (a similar issue occurred in submitAnswer() when answer.latex was not valid). We will add logging in the submitAnswer() case to see if we can draw any insights on that issue as well as this one.

@nithusha21 nithusha21 mentioned this issue Jun 1, 2019
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seanlip pushed a commit that referenced this issue Jun 15, 2019
@nithusha21 @seanlip
Add logging for #6702, #6604 (#6833)
9658729 
* add logging for guppy error, and filter expression error

* fix lint

* fix merge and review comments
@kevintab95
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Closing this issue for now since it has not occured on the server for a while. Will reopen if it surfaces again. Thanks!

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@kevintab95 @nithusha21