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Editorial Team
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Asked: 2026-06-04T18:47:04+00:00

When ArrayLen is called with an element that is null, it throws an error.

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When ArrayLen is called with an element that is null, it throws an error. How do you make it return 0?

The value '' cannot be converted to a number.

The error occurred in D:/Resource/WWW/DEV/ww1dev.cwtvacations.com/welcome_survey/welcome_survey_question_builder.cfm: line 12

10 :    <cfset curPage = SESSION.thisPage />
11 : 
12 :    <cfloop from="1" to="#ArrayLen(SESSION.WHSurveyStruct.pagesQuestions[curPage])#" index="curQuestion">
13 :        <cfif (SESSION.WHSurveyStruct.pagesQuestions[curPage][curQuestion].SectionID eq 4 AND SESSION.WHSurveyStruct.AirlineID neq 0)   <!--- Ask airline questions, if airline known  --->
14 :                OR (SESSION.WHSurveyStruct.pagesQuestions[curPage][curQuestion].SectionID neq 4
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1 Answer

  1. Editorial Team

    There is a couple things you can do. You can use a ternary operator and assign the whole thing to a variable:

    upperBound = isNull(SESSION.WHSurveyStruct.pagesQuestions[curPage]) ? 0 : ArrayLen(SESSION.WHSurveyStruct.pagesQuestions[curPage]);

    Or you can check it before hand. However, it appeared odd that you are specifying a specific element of an array as the array. i.e. SESSION.WHSurveyStruct.pagesQuestions[curPage] does pagesQuestions[] contain the array or is it the array? If it is the array, remove the [curParge] index.

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