SIGFPE in plugins/LadspaEffect/swh/ladspa/bandpass_iir_1892.xml:50

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### System Information

Linux pc.localdomain 6.12.49 12 SMP PREEMPT_DYNAMIC Mon Sep 29 09:21:28 CEST 2025 x86_64 AMD Ryzen 5 5500 AuthenticAMD GNU/Linux

### LMMS Version(s)

LMMS 1.3.0-alpha.1.895+fcb356d (Linux x86_64, Qt 5.15.16, GCC Clang 18.1.6)

### Most Recent Working Version

_No response_

### Bug Summary

During startup I got

Thread 1 "lmms" received signal SIGFPE, Arithmetic exception.
0x00007fa40040f6f9 in lmms::gui::SaWaterfallView::yPixelToTime (
this=0x558c1840ba20, position=148, height=147)
at /usr/src/lmms-master-current/plugins/SpectrumAnalyzer/SaWaterfallView.cpp:207
207 float pixels_per_line = (float)height / m_processor->waterfallHeight();

### Expected Behaviour

no SIGFPE

### Steps To Reproduce

enable FPE debug
build lmms
w/ new build open lmms project w/ SpectrumAnalyzer

### Logs

Click to expand

  (gdb) bt

#0  0x00007fa40040f6f9 in lmms::gui::SaWaterfallView::yPixelToTime(float, int)

    (this=0x558c1840ba20, position=148, height=147)

    at /usr/src/lmms-master-current/plugins/SpectrumAnalyzer/SaWaterfallView.cpp:207

#1  lmms::gui::SaWaterfallView::makeTimeTics[abi:cxx11]()

    (this=this@entry=0x558c1840ba20)

    at /usr/src/lmms-master-current/plugins/SpectrumAnalyzer/SaWaterfallView.cpp:219

#2  0x00007fa40040f444 in lmms::gui::SaWaterfallView::SaWaterfallView(lmms::SaControls*, lmms::SaProcessor*, QWidget*)

    (this=0x558c1840ba20, controls=, processor=0x558c15d435c0, _parent=)

    at /usr/src/lmms-master-current/plugins/SpectrumAnalyzer/SaWaterfallView.cpp:66

#3  0x00007fa400407b1f in lmms::gui::SaControlsDialog::SaControlsDialog(lmms::SaControls*, lmms::SaProcessor*)

    (this=0x558c184073b0, controls=0x558c15d43738, processor=0x558c15d435c0)

    at /usr/src/lmms-master-current/plugins/SpectrumAnalyzer/SaControlsDialog.cpp:335

#4  0x00007fa400404188 in lmms::SaControls::createView() (this=0x558c15d43738)

    at /usr/src/lmms-master-current/plugins/SpectrumAnalyzer/SaControls.cpp:129

#5  0x0000558bf13c8fdb in lmms::gui::EffectView::EffectView(lmms::Effect*, QWidget*) (this=0x558c18402620, _model=0x558c15d43130, _parent=)

--Type  for more, q to quit, c to continue without paging--c

    at /usr/src/lmms-master-current/src/gui/EffectView.cpp:89

#6  0x0000558bf13c7c37 in lmms::gui::EffectRackView::update()

    (this=0x558c158e1b90)

    at /usr/src/lmms-master-current/src/gui/EffectRackView.cpp:176

#7  0x00007fa439d00032 in  () at /usr/lib64/libQt5Core.so.5

#8  0x0000558bf13396ad in lmms::EffectChain::loadSettings(QDomElement const&)

    (this=0x558c0d6d0ac0, _this=)

    at /usr/src/lmms-master-current/src/core/EffectChain.cpp:116

#9  0x0000558bf13837e0 in lmms::SerializingObject::restoreState(QDomElement const&) (this=0x558c15d435c0, element=...)

    at /usr/src/lmms-master-current/src/core/SerializingObject.cpp:71

#10 0x0000558bf1342b4c in lmms::Mixer::loadSettings(QDomElement const&)

    (this=0x558c0d677520, _this=)

    at /usr/src/lmms-master-current/src/core/Mixer.cpp:858

#11 0x0000558bf13837e0 in lmms::SerializingObject::restoreState(QDomElement const&) (this=0x558c15d435c0, element=...)

    at /usr/src/lmms-master-current/src/core/SerializingObject.cpp:71

#12 0x0000558bf134dea9 in lmms::JournallingObject::restoreState(QDomElement const&) (this=0x558c15d435c0, _this=...)

    at /usr/src/lmms-master-current/src/core/JournallingObject.cpp:92

#13 0x0000558bf1387678 in lmms::Song::loadProject(QString const&)

    (this=0x558c0d505d50, fileName=...)

    at /usr/src/lmms-master-current/src/core/Song.cpp:1102

#14 0x0000558bf14b9958 in main(int, char**) (argc=2, argv=)

    at /usr/src/lmms-master-current/src/core/main.cpp:868

(gdb)

### Screenshots / Minimum Reproducible Project

_No response_

### Please search the issue tracker for existing bug reports before submitting your own.

- [x] I have searched all existing issues and confirmed that this is not a duplicate.

Start in plugins/SpectrumAnalyzer/SaWaterfallView.cpp at yPixelToTime() line 207 and inspect its caller makeTimeTics(). Reproduce with FPE debugging by opening a project containing SpectrumAnalyzer, then verify startup and project loading complete without SIGFPE.

Written by the indexing model from the issue text.