In the absence of an objection to the alleged improper charge or reservation of the right to object, the asserted error is waived. Lynn v. State, 162 Ga. App. 437 ( 291 S.E.2d 572). 3. Appellant complains in his enumeration of error 6 that the trial court erred in allowing a witness to testify who had not been furnished the defense in response to its demand for a list of witnesses.