Exception reported: Entity -1 (-1) is invalid

[Rushaway]

CBaseEntityList::AddNonNetworkableEntity: no free slots!
CBaseEntityList::AddNonNetworkableEntity: no free slots!
CBaseEntityList::AddNonNetworkableEntity: no free slots!
L 11/17/2023 - 16:46:07: [SM] Exception reported: Entity -1 (-1) is invalid
L 11/17/2023 - 16:46:07: [SM] Blaming: base/ServerAdvertisements.smx
L 11/17/2023 - 16:46:07: [SM] Call stack trace:
L 11/17/2023 - 16:46:07: [SM]   [0] DispatchKeyValue
L 11/17/2023 - 16:46:07: [SM]   [1] Line 298, ServerAdvertisement/addons/sourcemod/scripting/files/misc.sp::HudMessage
L 11/17/2023 - 16:46:07: [SM]   [2] Line 544, ServerAdvertisement/addons/sourcemod/scripting/ServerAdvertisements.sp::Timer_PrintMessage