(Urgent) Missing Data- Missed completely one item through out the study

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Hello Everyone,
I ve been encounter one serious issue of missing data for my research. That is, i forgot to include one item in my research. Originally, there are 22 items and i missed one item in the survey. Unluckily, i realize this serious problem after the data collection was completed.
What can i do now? Can i use any missing data analysis? like mean substitution ?

thanks
 
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