🚨 Error: Null promise in layoutCallback

[ampprojectbot]

Details

Error report: link
First seen: Oct 5, 2017
Frequency: ~ 114322/day

Stacktrace

Error: Null promise in layoutCallback
    at Error (https://raw.githubusercontent.com/ampproject/amphtml/2004030010070/src/log.js:714)
    at apply (https://raw.githubusercontent.com/ampproject/amphtml/2004030010070/src/log.js:308)
    at apply (https://raw.githubusercontent.com/ampproject/amphtml/2004030010070/src/log.js:323)
    at error (https://raw.githubusercontent.com/ampproject/amphtml/2004030010070/extensions/amp-a4a/0.1/amp-a4a.js:1090)
    at attemptToRenderCreative (https://raw.githubusercontent.com/ampproject/amphtml/2004030010070/extensions/amp-a4a/0.1/amp-a4a.js:1075)
    at layoutCallback (https://raw.githubusercontent.com/ampproject/amphtml/2004030010070/src/custom-element.js:1189)
    at (https://raw.githubusercontent.com/ampproject/amphtml/2004030010070/src/utils/promise.js:75)
    at (https://raw.githubusercontent.com/ampproject/amphtml/2004030010070/src/utils/promise.js:74)
    at tryResolve (https://raw.githubusercontent.com/ampproject/amphtml/2004030010070/src/custom-element.js:1189)

/cc @rsimha modified src/log.js:308-311 in ampproject#21212 (May 16, 2019)
/cc @zhouyx modified src/custom-element.js:1188-1189 in ampproject#15410 (May 17, 2018)
/cc @jridgewell modified src/utils/promise.js:71-78 in ampproject#15143 (May 8, 2018)