Unity - can't build standalone test player

I am using:
unity 2021.2.15f1
fmod 2.02.04

When I try to build a standalone test player for Linux64 I get this error:

NullReferenceException: Object reference not set to an instance of an object
  at FMODUnity.EditorSettings.PreprocessStaticPlugins (FMODUnity.Platform platform, UnityEditor.BuildTarget target) [0x00023] in /builds/bossians/prototypes/they-come-at-night/Assets/Plugins/FMOD/src/Editor/EditorSettings.cs:513 
  at FMODUnity.EditorSettings.PreprocessBuild (UnityEditor.BuildTarget target, FMODUnity.Platform+BinaryType binaryType) [0x0000e] in /builds/bossians/prototypes/they-come-at-night/Assets/Plugins/FMOD/src/Editor/EditorSettings.cs:487 
  at FMODUnity.EditorSettings+BuildProcessor.OnPreprocessBuild (UnityEditor.Build.Reporting.BuildReport report) [0x0005b] in /builds/bossians/prototypes/they-come-at-night/Assets/Plugins/FMOD/src/Editor/EditorSettings.cs:631 
  at UnityEditor.Build.BuildPipelineInterfaces+<>c__DisplayClass16_0.<OnBuildPreProcess>b__1 (UnityEditor.Build.IPreprocessBuildWithReport bpp) [0x00000] in /home/bokken/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:436 
  at UnityEditor.Build.BuildPipelineInterfaces.InvokeCallbackInterfacesPair[T1,T2] (System.Collections.Generic.List`1[T] oneInterfaces, System.Action`1[T] invocationOne, System.Collections.Generic.List`1[T] twoInterfaces, System.Action`1[T] invocationTwo, System.Boolean exitOnFailure) [0x000ff] in /home/bokken/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:402 
UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
UnityEngine.DebugLogHandler:LogException(Exception, Object)
UnityEngine.Logger:LogException(Exception, Object)
UnityEngine.Debug:LogException(Exception)
UnityEditor.Build.BuildPipelineInterfaces:InvokeCallbackInterfacesPair(List`1, Action`1, List`1, Action`1, Boolean) (at /home/bokken/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:415)
UnityEditor.Build.BuildPipelineInterfaces:OnBuildPreProcess(BuildReport) (at /home/bokken/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:434)
UnityEditor.BuildPipeline:BuildPlayerInternalNoCheck(String[], String, String, BuildTargetGroup, BuildTarget, Int32, BuildOptions, String[], Boolean)
UnityEditor.BuildPipeline:BuildPlayerInternal(String[], String, String, BuildTargetGroup, BuildTarget, Int32, BuildOptions, String[]) (at /home/bokken/buildslave/unity/build/Editor/Mono/BuildPipeline.bindings.cs:448)
UnityEditor.BuildPipeline:BuildPlayer(String[], String, String, BuildTargetGroup, BuildTarget, Int32, BuildOptions, String[]) (at /home/bokken/buildslave/unity/build/Editor/Mono/BuildPipeline.bindings.cs:347)
UnityEditor.BuildPipeline:BuildPlayer(BuildPlayerOptions) (at /home/bokken/buildslave/unity/build/Editor/Mono/BuildPipeline.bindings.cs:321)
UnityEditor.TestTools.TestRunner.PlayerLauncher:BuildAndRunPlayer(PlayerLauncherBuildOptions) (at Library/PackageCache/com.unity.test-framework@1.1.31/UnityEditor.TestRunner/TestLaunchers/PlayerLauncher.cs:144)
UnityEditor.TestTools.TestRunner.PlayerLauncher:Run() (at Library/PackageCache/com.unity.test-framework@1.1.31/UnityEditor.TestRunner/TestLaunchers/PlayerLauncher.cs:80)
UnityEditor.TestTools.TestRunner.TestRun.Tasks.<Execute>d__0:MoveNext() (at Library/PackageCache/com.unity.test-framework@1.1.31/UnityEditor.TestRunner/TestRun/Tasks/LegacyPlayerRunTask.cs:14)
UnityEditor.TestTools.TestRunner.TestRun.TestJobRunner:ExecuteStep() (at Library/PackageCache/com.unity.test-framework@1.1.31/UnityEditor.TestRunner/TestRun/TestJobRunner.cs:124)
UnityEditor.EditorApplication:Internal_CallUpdateFunctions() (at /home/bokken/buildslave/unity/build/Editor/Mono/EditorApplication.cs:356)

Anyone have any ideas?

I have not been able to reproduce this issue. What distro are you using, and do you have any platforms listed in the “Platform Specific” section of the Unity FMOD Settings? e.g


If not, can you please press the “+” button and try adding a platform target for “Linux”?