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avoid type errors when checking #3

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avoid type errors when checking #3

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4 changes: 3 additions & 1 deletion nrrd.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1128,7 +1128,9 @@ function checkNRRD(ret) {
// TODO: Check space/orientation fields.

// We should either have inline data or external data
if ((ret.data === undefined || ret.data.length === 0) && (ret.buffer === undefined || ret.buffer.byteLength === 0) && ret.dataFile === undefined) {
if ((ret.data === undefined || (ret.data && ret.data.length === 0)) &&
(ret.buffer === undefined || (ret.buffer && ret.buffer.byteLength === 0)) &&
ret.dataFile === undefined) {
throw new Error("NRRD file has neither inline or external data!");
}
}
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