Lindsey Buckingham was reportedly attacked by a zealous fan when arriving at an early morning appointment in California. 

The 76-year-old former Fleetwood Mac guitarist was doused with an “unknown substance” by a woman when he walked into the Santa Monica building on Wednesday, April 1, according to NBC4 Investigates

Authorities told the outlet that the woman, who is being regarded as a stalking suspect, has been involved in past run-ins with Buckingham. It’s unclear what type of appointment he was attending, but police believe she coordinated her attack with his scheduled engagement.

Buckingham was not injured in the incident, law enforcement told NBC4 Investigates, and no arrests have been made. 

The incident comes days after Buckingham began teasing a reunion with his ex-lover and former Fleetwood Mac bandmate Stevie Nicks. Last year, the two previously reconciled to reissue their 1973 album “Buckingham Nicks,” their only studio release as a duo.

“The energy in terms of what ‘Buckingham Nicks’ did to sort of create a resurgence of connection between Stevie and myself, I think on a larger scale, that seems to be something that’s in the air,” Buckingham said in an Instagram video shared Friday, March 27. “And what that translates to specifically, I wouldn’t want to speculate yet.”

Buckingham’s remark spurred speculation of new music or another form of collaboration from the two artists. 

Buckingham and Nicks met while attending Menlo-Atherton High School, before eventually moving out of the Bay Area and famously joining Fleetwood Mac in 1975.