The court's warning came after the man tendered an apology for his "inadvertent mistake".
Vijender Sharma, who had stood as additional surety for accused Asif Balwa and Karim Morani when they were allowed to visit abroad by the court, said that it was an inadvertent mistake "committed due to phonetics in pronouncing his name".
Defence counsel Vijay Aggarwal assured the court that they would be careful in future and the lapse be condoned.
The court also discharged Sharma as additional surety and said that three fixed deposit receipts furnished by him be also returned.
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On October 28, the court had sought an explanation from Sharma for his act.
It had said that Sharma had stood as additional surety for Balwa, facing trial in two separate 2G scam cases, when he was allowed to go abroad on October 17 but had furnished surety bond in the name of Vijender Kumar Sharma in both the matters.
Morani, Balwa and others, including former Telecom Minister A Raja and DMK MP Kanimozhi, are facing trial in the 2G spectrum case.
Balwa and Morani, along with others, are also accused in a 2G scam-related alleged money laundering case probed by the Enforcement Directorate (ED).