I created a simple project like this:

import qbs 1.0

test.qbs:

Project {
    minimumQbsVersion: "1.14"
    qbsSearchPaths: "qbs"
    Application {
        destinationDirectory: "bin"
        name: "MemoVache"
        cpp.includePaths: sourceDirectory
        cpp.cxxLanguageVersion:"c++14"
        files: [
        "src/main.cpp",
        ]
        Depends { name: "cpp" }
        Depends { name: "Qt"; submodules: ["core"] }
    }
}

main.cpp:

int main(int argc, char *argv[])
{
    return 0;
}

The first run of qbs install works whereas the second one generates this:

raphael@raph-pc:~/src/Marguerite/builder$ ./builder.sh
Restoring build graph from disk
Building for configuration Debug
ERROR: /home/qt/work/build/qt-creator/src/shared/qbs/src/lib/corelib/buildgraph/rulesapplicator.cpp:244 ASSERT: m_ruleNode->children.contains(input)
The following products could not be built for configuration Debug:
MemoVache