Filters referencing non-existing objects stop an export

Error:
Trying to export Filter found error: String index out of range: 0
Location
[Dashboard UserY:XXXXX Dashboard] [Gadget rest/gadgets/1.0/g/com.atlassian.jira.gadgets:road-map-gadget/gadgets/roadmap-gadget.xml] [User preference projectsOrCategories] [ Translating project id 18405]
java.lang.StringIndexOutOfBoundsException: String index out of range: 0
        at java.lang.String.charAt(String.java:658)
        at com.awnaba.projectconfigurator.utils.PCStringUtils.isQuoted(PCStringUtils.java:10)
        at com.awnaba.projectconfigurator.utils.PCStringUtils.quoteIfNotQuoted(PCStringUtils.java:31)
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
        at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
        at com.awnaba.projectconfigurator.jiraobjectfacades.QueryTranslator$OperandTranslator.visit(QueryTranslator.java:514)
        at com.awnaba.projectconfigurator.jiraobjectfacades.QueryTranslator$OperandTranslator.visit(QueryTranslator.java:1)
        at com.atlassian.query.operand.FunctionOperand.accept(FunctionOperand.java:66)
        at com.awnaba.projectconfigurator.jiraobjectfacades.QueryTranslator.translateOperand(QueryTranslator.java:610)
        at com.awnaba.projectconfigurator.jiraobjectfacades.QueryTranslator.translateClause(QueryTranslator.java:572)
        at com.awnaba.projectconfigurator.jiraobjectfacades.QueryTranslator.visit(QueryTranslator.java:565)
        at com.awnaba.projectconfigurator.jiraobjectfacades.QueryTranslator.visit(QueryTranslator.java:1)
        at com.atlassian.query.clause.TerminalClauseImpl.accept(TerminalClauseImpl.java:143)
        at com.awnaba.projectconfigurator.jiraobjectfacades.QueryTranslator.visit(QueryTranslator.java:634)
        at com.awnaba.projectconfigurator.jiraobjectfacades.QueryTranslator.visit(QueryTranslator.java:1)
        at com.atlassian.query.clause.OrClause.accept(OrClause.java:28)
        at com.awnaba.projectconfigurator.jiraobjectfacades.FilterToolsImpl.normalizeQuery(FilterToolsImpl.java:136)
        at com.awnaba.projectconfigurator.jiraobjectfacades.FilterToolsImpl.getQuery(FilterToolsImpl.java:125)
        at com.awnaba.projectconfigurator.projectconfigserialize.FilterGlobalTable.insert(FilterGlobalTable.java:64)
        at com.awnaba.projectconfigurator.projectconfigserialize.FilterGlobalTable.insert(FilterGlobalTable.java:1)
        at com.awnaba.projectconfigurator.projectconfigserialize.AbstractGlobalTable$1.doAndReturn(AbstractGlobalTable.java:26)
        at com.awnaba.projectconfigurator.projectconfigserialize.AbstractGlobalTable$1.doAndReturn(AbstractGlobalTable.java:1)
        at com.awnaba.projectconfigurator.utils.SmartErrorReporter.wrapSafely(SmartErrorReporter.java:99)
...