Steps to reproduce:

• create multi-configuration project with axis "Slaves"
• add build parameter of type "Credentials Parameter"
• add minimal build step, e.g. execute shell "echo HOWDY"
• build project using some credential

Resulting console output:
Started by user t761
[EnvInject] - Loading node environment variables.
Building remotely on Slave_extend_SEU_Linux3_Slk (Slk_Linux) in workspace /home/hudrun/slave3_jenkins.eng.zkb.ch_produktiv/workspace/0195-SLK-GKKKK-ReferenceRepo
FATAL: null
java.lang.NullPointerException
at com.cloudbees.plugins.credentials.CredentialsParameterValue.lookupCredentials(CredentialsParameterValue.java:98)
at com.cloudbees.plugins.credentials.CredentialsParameterValue.lookupCredentials(CredentialsParameterValue.java:92)
at com.cloudbees.plugins.credentials.CredentialsParameterValue.createVariableResolver(CredentialsParameterValue.java:74)
at hudson.matrix.FilterScript.getConfiguredBinding(FilterScript.java:97)
at hudson.matrix.FilterScript.apply(FilterScript.java:75)
at hudson.matrix.DefaultMatrixExecutionStrategyImpl.filterConfigurations(DefaultMatrixExecutionStrategyImpl.java:190)
at hudson.matrix.DefaultMatrixExecutionStrategyImpl.run(DefaultMatrixExecutionStrategyImpl.java:121)
at hudson.matrix.MatrixBuild$MatrixBuildExecution.doRun(MatrixBuild.java:364)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:536)
at hudson.model.Run.execute(Run.java:1738)
at hudson.matrix.MatrixBuild.run(MatrixBuild.java:313)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:381)
Finished: FAILURE